62
62
Sep 21, 2013
09/13
by
R. Demarco; H. C. Ford; P. Rosati
texts
eye 62
favorite 0
comment 0
High redshift (z >~ 1) clusters are ideal probes to study the formation and evolution of large scale structures and galaxies in the universe. A 10-m class ground based telescope, X-ray observatories (Chandra, XMM-Newton) and HST/ACS are allowing us to perform an unprecedented study of distant massive clusters of galaxies in the redshift range 0.84
Source: http://arxiv.org/abs/astro-ph/0508080v2
46
46
Sep 21, 2013
09/13
by
H. C. Ford; Z. I. Tsvetanov; L. Ferrarese; W. Jaffe
texts
eye 46
favorite 0
comment 0
After correcting spherical aberration in the Hubble Space Telescope in 1993, the central masses of galaxies can be measured with a resolution 5 to 10 times better than can be achieved at the best terrestrial sites. This improvement in resolution is decisive for detecting the gravitational signature of massive black holes in galaxy nuclei. The discovery of small (r ~ 100-200 pc) rotating gaseous and stellar disks in the centers of many early-type galaxies provides a new and efficient means for...
Source: http://arxiv.org/abs/astro-ph/9711299v1
38
38
Sep 18, 2013
09/13
by
Z. I. Tsvetanov; M. G. Allen; H. C. Ford; R. J. Harms
texts
eye 38
favorite 0
comment 0
A deep, fuly sampled diffraction limited (FWHM ~ 70 mas) narrow-band image of the central region in M87 was obtained with the Wide Filed and Planetary Camera 2 of the Hubble Space Telescope using the dithering technique. The H-alpha+[NII] continuum subtracted image reveals a wealth of details in the gaseous disk structure described earlier by Ford et al. (1994). The disk morphology is dominated by a well defined three-arm spiral pattern. In addition, the major spiral arms contain a large number...
Source: http://arxiv.org/abs/astro-ph/9803178v1
57
57
Sep 23, 2013
09/13
by
H. C. Ford; W. Bhatti; L. Hebb; L. Petro; M. Richmond; J. Rogers
texts
eye 57
favorite 0
comment 0
The small sizes of low mass stars in principle provide an opportunity to find Earth-like planets and "super-Earths" in habitable zones via transits. Large area synoptic surveys like Pan-STARRS and LSST will observe large numbers of low mass stars, albeit with widely spaced (sparse) time sampling relative to the planets' periods and transit durations. We present simple analytical equations that can be used to estimate the feasibility of a survey by setting upper limits to the number of...
Source: http://arxiv.org/abs/0903.1285v1
138
138
Sep 23, 2013
09/13
by
M. J. Jee; J. P. Blakeslee; M. Sirianni; A. R. Martel; R. L. White; H. C. Ford
texts
eye 138
favorite 0
comment 0
We describe the time- and position-dependent point spread function (PSF) variation of the Wide Field Channel (WFC) of the Advanced Camera for Surveys (ACS) with the principal component analysis (PCA) technique. The time-dependent change is caused by the temporal variation of the $HST$ focus whereas the position-dependent PSF variation in ACS/WFC at a given focus is mainly the result of changes in aberrations and charge diffusion across the detector, which appear as position-dependent changes in...
Source: http://arxiv.org/abs/0710.5560v1
50
50
Sep 18, 2013
09/13
by
D. R. Ardila; D. A. Golimowski; J. E. Krist; M. Clampin; H. C. Ford; G. D. Illingworth
texts
eye 50
favorite 0
comment 0
We present ACS/HST coronagraphic observations of HD 100546, a B9.5 star, 103 pc away from the sun, taken in the F435W, F606W, and F814W bands. Scattered light is detected up to 14'' from the star. The observations are consistent with the presence of an extended flattened nebula with the same inclination as the inner disk. The well-known ``spiral arms'' are clearly observed and they trail the rotating disk material. Weaker arms never before reported are also seen. The inter-arm space becomes...
Source: http://arxiv.org/abs/0704.1507v1
62
62
Sep 19, 2013
09/13
by
H. D. Tran; Z. Tsvetanov; H. C. Ford; J. Davies; W. Jaffe; F. C. van den Bosch; A. Rest
texts
eye 62
favorite 0
comment 0
We examine the dust properties of a nearby distance-limited sample of early type galaxies using the WFPC2 of the Hubble Space Telescope. Dust is detected in 29 out of 67 galaxies (43%), including 12 with small nuclear dusty disks. In a separate sample of 40 galaxies biased for the detection of dust by virtue of their detection in the IRAS 100 micron band, dust is found in ~78% of the galaxies, 15 of which contain dusty disks. In those galaxies with detectable dust, the apparent mass of the dust...
Source: http://arxiv.org/abs/astro-ph/0102292v1
94
94
Sep 20, 2013
09/13
by
M. J. Jee; R. L. White; H. C. Ford; G. D. Illingworth; J. P. Blakeslee; B. Holden; S. Mei
texts
eye 94
favorite 0
comment 0
(Abridged) We present a HST/ACS weak-lensing study of RX J0849+4452 and RX J0848+4453, the two most distant (at z=1.26 and z=1.27, respectively) clusters yet measured with weak-lensing. The two clusters are separated by ~4' from each other and appear to form a supercluster in the Lynx field. Using our deep ACS F775W and F850LP imaging, we detected weak-lensing signals around both clusters at ~4 sigma levels. The mass distribution indicated by the reconstruction map is in good spatial agreement...
Source: http://arxiv.org/abs/astro-ph/0601334v1
46
46
Sep 19, 2013
09/13
by
Z. I. Tsvetanov; G. F. Hartig; H. C. Ford; G. A. Kriss; M. A. Dopita; L. L. Dressel; R. J. Harms
texts
eye 46
favorite 0
comment 0
The nuclear spectrum of M87 covering the Ly_a-H_a wavelength range was obtained with the HST Faint Object Spectrograph (FOS) trough a 0.21 arcsec aperture. Contrary to some previous claims, a single power law (F(nu)~nu^(-a)) can not reproduce the observed continuum shape and at least a broken power law is require for a good fit (a = 1.75 and 1.41 shortward and longward of the break at ~4500 A). We detect a set of broad (FWHM ~ 400 km/s) absorption lines arising in the gas associated with M87....
Source: http://arxiv.org/abs/astro-ph/9801037v1
60
60
Sep 22, 2013
09/13
by
M. J. Jee; R. L. White; N. Benitez; H. C. Ford; J. P. Blakeslee; P. Rosati; R. Demarco; G. D. Illingworth
texts
eye 60
favorite 0
comment 0
We present a weak lensing analysis of the X-ray luminous cluster CL 0152-1357 at z~0.84 using HST/ACS observations. The unparalleled resolution and sensitivity of ACS enable us to measure weakly distorted, faint background galaxies to the extent that the number density reaches ~175 arcmin^-2. The PSF of ACS has a complicated shape that also varies across the field. We construct a PSF model for ACS from an extensive investigation of 47 Tuc stars in a modestly crowded region. We show that this...
Source: http://arxiv.org/abs/astro-ph/0409304v1
63
63
Sep 21, 2013
09/13
by
M. J. Jee; R. L. White; H. C. Ford; J. P. Blakeslee; G. D. Illingworth; D. A. Coe; K. -V. H. Tran
texts
eye 63
favorite 0
comment 0
We present Hubble Space Telescope/Advanced Camera for Surveys (ACS) weak-lensing and Chandra X-ray analyses of MS 1054-0321 at z=0.83, the most distant and X-ray luminous cluster in the Einstein Extended Medium-Sensitivity Survey (EMSS). The high-resolution mass reconstruction through ACS weak-lensing reveals the complicated dark matter substructure in unprecedented detail, characterized by the three dominant mass clumps with the four or more minor satellite groups within the current ACS field....
Source: http://arxiv.org/abs/astro-ph/0508044v1
45
45
Sep 18, 2013
09/13
by
N. L. Homeier; M. Postman; F. Menanteau; J. P. Blakeslee; S. Mei; R. Demarco; H. C. Ford; G. D. Illingworth; A. Zirm
texts
eye 45
favorite 0
comment 0
We present a comparison of late-type galaxies (Sa and later) in intermediate redshift clusters and the field using ACS imaging of four cluster fields: CL0152-1357, CL1056-0337 (MS1054), CL1604+4304, and CL1604+4321. Concentration, asymmetry, and clumpiness parameters are calculated for each galaxy in blue (F606W or F625W) and red (F775W or F814W) filters. Galaxy half-light radii, disk scale lengths, color gradients, and overall color are compared. We find marginally significant differences in...
Source: http://arxiv.org/abs/astro-ph/0509650v3
48
48
Sep 18, 2013
09/13
by
A. Rettura; P. Rosati; M. Nonino; R. A. E. Fosbury; R. Gobat; N. Menci; V. Strazzullo; S. Mei; R. Demarco; H. C. Ford
texts
eye 48
favorite 0
comment 0
We derive stellar masses, ages and star formation histories of massive early-type galaxies in the z=1.237 RDCS1252.9-2927 cluster and compare them with those measured in a similarly mass-selected sample of field contemporaries drawn from the GOODS South Field. Robust estimates of these parameters are obtained by comparing a large grid of composite stellar population models with 8-9 band photometry in the rest-frame NUV, optical and IR, thus sampling the entire relevant domain of emission of the...
Source: http://arxiv.org/abs/0806.4604v1
46
46
Sep 20, 2013
09/13
by
John E. Krist; D. R. Ardila; D. A. Golimowski; M. Clampin; H. C. Ford; G. D. Illingworth; G. F. Hartig; the ACS Science Team
texts
eye 46
favorite 0
comment 0
We present {\it Hubble Space Telescope} Advanced Camera for Surveys multicolor coronagraphic images of the recently discovered edge-on debris disk around the nearby ($\sim10$ pc) M dwarf AU Microscopii. The disk is seen between $r = $0\farcs 75 -- 15'' (7.5 -- 150 AU) from the star. It has a thin midplane with a projected full-width-at-half-maximum (FWHM) thickness of 2.5 -- 3.5 AU within $r < 50$ AU of the star that increases to 6.5 -- 9 AU at $r \sim 75$ AU. The disk's radial brightness...
Source: http://arxiv.org/abs/astro-ph/0410466v1
41
41
Sep 21, 2013
09/13
by
L. D. Bradley; R. J. Bouwens; A. Zitrin; R. Smit; D. Coe; H. C. Ford; W. Zheng; G. D. Illingworth; N. Benítez; T. J. Broadhurst
texts
eye 41
favorite 0
comment 0
We report the discovery of seven strongly lensed Lyman break galaxy (LBG) candidates at z~7 detected in Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) imaging of Abell 1703. The brightest candidate, called A1703-zD1, has an observed (lensed) magnitude of 24.0 AB (26 sigma) in the WFC3/IR F160W band, making it 0.2 magnitudes brighter than the z_850-dropout candidate recently reported behind the Bullet Cluster and 0.7 magnitudes brighter than the previously brightest known z~7.6 galaxy,...
Source: http://arxiv.org/abs/1104.2035v3
58
58
Sep 22, 2013
09/13
by
M. J. Jee; P. Rosati; H. C. Ford; K. S. Dawson; C. Lidman; S. Perlmutter; R. Demarco; V. Strazzullo; C. Mullis; H. Böhringer; R. Fassbender
texts
eye 58
favorite 0
comment 0
We present a weak-lensing analysis of the z=1.4 galaxy cluster XMMU J2235.3-2557, based on deep Advanced Camera for Surveys images. Despite the observational challenge set by the high redshift of the lens, we detect a substantial lensing signal at the >~ 8 sigma level. This clear detection is enabled in part by the high mass of the cluster, which is verified by our both parametric and non-parametric estimation of the cluster mass. Assuming that the cluster follows a Navarro-Frenk-White mass...
Source: http://arxiv.org/abs/0908.3897v1
48
48
Sep 23, 2013
09/13
by
A. R. Martel; H. C. Ford; L. D. Bradley; H. D. Tran; F. Menanteau; Z. I. Tsvetanov; G. D. Illingworth; G. F. Hartig; M. Clampin
texts
eye 48
favorite 0
comment 0
We present $V$ and $I$ continuum images and H$\alpha$+[N II] maps of nine early-type galaxies observed with the Wide Field Channel of the Advanced Camera for Surveys on the Hubble Space Telescope. Dust and ionized gas are detected in all galaxies. The optical nebulae are primarily concentrated on the nuclei and extend out to radii of a few hundred parsecs, in compact clumps, filaments, or disks. Two galaxies, NGC 6166 and NGC 6338, also possess diffuse, ionized filaments on kiloparsec scales....
Source: http://arxiv.org/abs/astro-ph/0411148v1
48
48
Sep 21, 2013
09/13
by
J. E. Krist; K. R. Stapelfeldt; D. A. Golimowski; D. R. Ardila; M. Clampin; A. R. Martel; H. C. Ford; G. D. Illingworth; G. F. Hartig
texts
eye 48
favorite 0
comment 0
Hubble Space Telescope Advanced Camera for Surveys images of the young binary GG Tauri and its circumbinary disk in V and I bandpasses were obtained in 2002 and are the most detailed of this system to date. The confirm features previously seen in the disk including: a "gap" apparently caused by shadowing from circumstellar material; an asymmetrical distribution of light about the line of sight on the near edge of the disk; enhanced brightness along the near edge of the disk due to...
Source: http://arxiv.org/abs/astro-ph/0508222v2
48
48
Sep 23, 2013
09/13
by
D. R. Ardila; D. A. Golimowski; J. E. Krist; M. Clampin; J. P. Williams; J. P. Blakeslee; H. C. Ford; G. F. Hartig; G. D. Illingworth
texts
eye 48
favorite 0
comment 0
We present resolved scattered-light images of the debris disk around HD 107146, a G2 star 28.5 pc from the Sun. This is the first debris disk to be resolved in scattered light around a solar-type star. We observed it with the HST/ACS coronagraph, using a 1.8'' occulting spot and the F606W (broad V) and F814W (broad I) filters. Within 2'' from the star, the image is dominated by PSF subtraction residuals. Outside this limit, the disk looks featureless except for a northeast-southwest brightness...
Source: http://arxiv.org/abs/astro-ph/0411422v2
42
42
Sep 22, 2013
09/13
by
R. P. Kudritzki; R. H. Mendez; J. J. Feldmeier; R. Ciardullo; G. H. Jacoby; K. C. Freeman; M. Arnaboldi; M. Capaccioli; O. Gerhard; H. C. Ford
texts
eye 42
favorite 0
comment 0
Narrow-band imaging surveys aimed at detecting the faint emission from the 5007 [O III] line of intracluster planetary nebulae in Virgo also probe high redshift z=3.1 Ly alpha emitters. Here we report on the spectroscopic identification of 9 Ly alpha emitters at z=3.13, obtained with the FORS spectrograph at Unit 1 of the ESO Very Large Telescope (VLT UT1). The spectra of these high redshift objects show a narrow, isolated Ly alpha emission with very faint (frequently undetected) continuum,...
Source: http://arxiv.org/abs/astro-ph/0001156v1
82
82
Sep 19, 2013
09/13
by
R. Demarco; R. Gobat; P. Rosati; C. Lidman; A. Rettura; M. Nonino; A. van der Wel; M. J. Jee; J. P. Blakeslee; H. C. Ford; M. Postman
texts
eye 82
favorite 0
comment 0
We present a spectrophotometric analysis of galaxies belonging to the dynamically young, massive cluster RX J0152.7-1357 at z~0.84, aimed at understanding the effects of the cluster environment on the star formation history (SFH) of cluster galaxies and the assembly of the red-sequence (RS). We use VLT/FORS spectroscopy, ACS/WFC optical and NTT/SofI near-IR data to characterize SFHs as a function of color, luminosity, morphology, stellar mass, and local environment from a sample of 134...
Source: http://arxiv.org/abs/1009.3986v1
30
30
Sep 18, 2013
09/13
by
R. Demarco; J. P. Blakeslee; H. C. Ford; N. L. Homeier; S. Mei; A. W. Zirm; P. Rosati; A. Rettura; C. Lidman; R. A. Overzier; G. K. Miley
texts
eye 30
favorite 0
comment 0
We have used the Advanced Camera for Surveys (ACS) on the HST to obtain optical imaging of a sample of 8 galaxy clusters in the redshift range 0.8 < z < 1.3. The ACS data provides accurate photometry and the ACS high angular resolution makes it possible to obtain crucial morphological information of the cluster galaxy populations. These data are supported by X-ray observations and by ground based imaging and multi-object spectroscopy. We will present results from this multi-wavelength...
Source: http://arxiv.org/abs/astro-ph/0509575v2
70
70
Sep 18, 2013
09/13
by
A. van der Wel; B. P. Holden; M. Franx; G. D. Illingworth; M. P. Postman; D. D. Kelson; I. Labbe; S. Wuyts; J. P. Blakeslee; H. C. Ford
texts
eye 70
favorite 0
comment 0
The Sloan Digital Sky Survey (SDSS) and photometric/spectroscopic surveys in the GOODS-South field (the Chandra Deep Field-South, CDFS) are used to construct volume-limited, stellar mass-selected samples of galaxies at redshifts 02.5. The fraction of E+S0 galaxies is 43+/-3%$ at z~0.03 and 48+/-7% at z~0.8, i.e., it has not changed significantly since z~0.8. When combined with recent results for cluster galaxies in the same redshift range, we find that the morphology-density relation for...
Source: http://arxiv.org/abs/0707.2787v2
4
4.0
Jun 30, 2018
06/18
by
W. Zheng; X. Shu; J. Moustakas; A. Zitrin; H. C. Ford; X. Huang; T. Broadhurst; A. Molino; J. M. Diego; L. Infante; F. E. Bauer; D. D. Kelson; R. Smit
texts
eye 4
favorite 0
comment 0
We report the discovery of 24 Lyman-break candidates at 7
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1402.6743
49
49
Sep 19, 2013
09/13
by
R. A. Overzier; T. M. Heckman; C. Tremonti; L. Armus; A. Basu-Zych; T. Goncalves; R. M. Rich; D. C. Martin; A. Ptak; D. Schiminovich; H. C. Ford; B. Madore; M. Seibert
texts
eye 49
favorite 0
comment 0
We present HST UV/optical imaging, Spitzer mid-IR photometry, and optical spectroscopy of a sample of 30 low-redshift (z=0.1-0.3) galaxies chosen from SDSS/GALEX to be accurate local analogs of the high-z Lyman Break Galaxies. The Lyman Break Analogs (LBAs) are similar in mass, metallicity, dust, SFR, size and gas velocity dispersion, thus enabling a detailed investigation of processes that are important at high-z. The optical emission line properties of LBAs are also similar to those of LBGs,...
Source: http://arxiv.org/abs/0910.1352v1
52
52
Sep 18, 2013
09/13
by
G. R. Meurer; D. Lindler; J. P. Blakeslee; C. Cox; A. R. Martel; H. D. Tran; R. J. Bouwens; H. C. Ford; M. Clampin; G. F. Hartig; M. Sirianni; G. de Marchi
texts
eye 52
favorite 0
comment 0
The off-axis location of the Advanced Camera for Surveys (ACS) is the chief (but not sole) cause of strong geometric distortion in all detectors: the Wide Field Camera (WFC), High Resolution Camera (HRC), and Solar Blind Camera (SBC). Dithered observations of rich star cluster fields are used to calibrate the distortion. We describe the observations obtained, the algorithms used to perform the calibrations and the accuracy achieved.
Source: http://arxiv.org/abs/astro-ph/0212208v1
93
93
Sep 23, 2013
09/13
by
W. Zheng; L. D. Bradley; R. J. Bouwens; H. C. Ford; G. D. Illingworth; N. Benitez; T. Broadhurst; B. Frye; L. Infante; M. J. Jee; V. Motta; X. W. Shu; A. Zitrin
texts
eye 93
favorite 0
comment 0
We report on the discovery of three bright, strongly-lensed objects behind Abell 1703 and CL0024+16 from a dropout search over 25 square arcminutes of deep NICMOS data, with deep ACS optical coverage. They are undetected in the deep ACS images below 8500 A and have clear detections in the J and H bands. Fits to the ACS, NICMOS and IRAC data yield robust photometric redshifts in the range z~6-7 and largely rule out the possibility that they are low-redshift interlopers. All three objects are...
Source: http://arxiv.org/abs/0903.3988v1
53
53
Sep 19, 2013
09/13
by
Gerhardt R. Meurer; Z. I. Tsvetanov; C. Gronwall; P. Capak; J. P. Blakeslee; N. Benítez; H. C. Ford; G. D. Illingworth; L. D. Bradley; N. Pirzkal; J. Walsh; R. J. Bouwens; S. Srinivasan
texts
eye 53
favorite 0
comment 0
We present complimentary techniques to find emission-line targets and measure their properties in a semi-automated fashion from grism observations obtained with the Advanced Camera for Surveys aboard the Hubble Space Telescope. The first technique is to find all likely sources in a direct image, extract their spectra and search them for emission lines. The second method is to look for emission-line sources as compact structures in an unsharp masked version of the grism image. Using these...
Source: http://arxiv.org/abs/astro-ph/0703288v1
67
67
Sep 23, 2013
09/13
by
D. A. Golimowski; J. E. Krist; K. R. Stapelfeldt; C. H. Chen; D. R. Ardila; G. Bryden; M. Clampin; H. C. Ford; G. D. Illingworth; P. Plavchan; G. H. Rieke; K. Y. L. Su
texts
eye 67
favorite 0
comment 0
[ABRIDGED] We present the first resolved images of the debris disk around the nearby K dwarf HD 92945. Our F606W (V) and F814W (I) HST/ACS coronagraphic images reveal an inclined, axisymmetric disk consisting of an inner ring 2".0-3".0 (43-65 AU) from the star and an extended outer disk whose surface brightness declines slowly with increasing radius 3".0-5".1 (65-110 AU) from the star. A precipitous drop in the surface brightness beyond 110 AU suggests that the outer disk is...
Source: http://arxiv.org/abs/1105.0888v1
6
6.0
Jun 30, 2018
06/18
by
W. Zheng; A. Zitrin; L. Infante; N. Laporte; X. X. Huang; J. Moustakas; H. C. Ford; X. W. Shu; J. X. Wang; J. M. Diego; F. E. Bauer; P. T. Iribarren; T. Broadhurst; A. Molino
texts
eye 6
favorite 0
comment 0
We search for high-redshift dropout galaxies behind the Hubble Frontier Fields (HFF) galaxy cluster MACS J1149.5+2223, a powerful cosmic lens that has revealed a number of unique objects in its field. Using the deep images from the Hubble and Spitzer space telescopes, we find 11 galaxies at z>7 in the MACS J1149.5+2223 cluster field, and 11 in its parallel field. The high-redshift nature of the bright z~9.6 galaxy MACS1149-JD, previously reported by Zheng et al., is further supported by...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1701.08484
116
116
Sep 19, 2013
09/13
by
M. Sirianni; M. J. Jee; N. Benitez; J. P. Blakeslee; A. R. Martel; G. Meurer; M. Clampin; G. De Marchi; H. C. Ford; R. Gilliland; G. F. Hartig; G. D. Illingworth; J. Mack; W. J. McCann
texts
eye 116
favorite 0
comment 0
We present the photometric calibration of the HST Advanced Camera for Surveys (ACS). We give here an overview of the performance and calibration of the 2 CCD cameras, the Wide Field Channel (WFC) and the High Resolution Channel (HRC), and a description of the best techniques for reducing ACS CCD data. On-orbit observations of spectrophotometric standard stars have been used to revise the pre-launch estimate of the instrument response curves to best match predicted and observed count rates....
Source: http://arxiv.org/abs/astro-ph/0507614v1
74
74
Sep 20, 2013
09/13
by
L. D. Bradley; R. J. Bouwens; H. C. Ford; G. D. Illingworth; M. J. Jee; N. Benitez; T. J. Broadhurst; M. Franx; B. L. Frye; L. Infante; V. Motta; P. Rosati; R. L. White; W. Zheng
texts
eye 74
favorite 0
comment 0
Using HST and Spitzer IRAC imaging, we report the discovery of a very bright strongly lensed Lyman break galaxy (LBG) candidate at z~7.6 in the field of the massive galaxy cluster Abell 1689. The galaxy candidate, which we refer to as A1689-zD1, shows a strong z-J break of at least 2.2 mag and is completely undetected (
Source: http://arxiv.org/abs/0802.2506v2
50
50
Sep 22, 2013
09/13
by
M. Lombardi; P. Rosati; J. P. Blakeslee; S. Ettori; R. Demarco; H. C. Ford; G. D. Illingworth; M. Clampin; G. F. Hartig; N. Benitez; T. J. Broadhurst; M. Franx; M. J. Jee; M. Postman; R. L. White
texts
eye 50
favorite 0
comment 0
We present a weak lensing analysis of one of the most distant massive galaxy cluster known, RDCS 1252.9-2927 at z=1.24, using deep images from the Advanced Camera for Survey (ACS) on board the Hubble Space Telescope (HST). By taking advantage of the depth and of the angular resolution of the ACS images, we detect for the first time at z>1 a clear weak lensing signal in both the i (F775W) and z (F850LP) filters. We measure a 5-\sigma signal in the i band and a 3-\sigma signal in the shallower...
Source: http://arxiv.org/abs/astro-ph/0501150v1
146
146
Jul 20, 2013
07/13
by
D. A. Golimowski; T. J. Henry; J. E. Krist; S. Dieterich; H. C. Ford; G. D. Illingworth; D. R. Ardila; M. Clampin; O. G. Franz; L. H. Wasserman; G. F. Benedict; B. E. McArthur; E. G. Nelan
texts
eye 146
favorite 0
comment 0
We report the detections of low-mass companions to five M and L dwarfs within 10 pc of the Sun using the Hubble Space Telescope (HST) Near-Infrared Camera and Multi-Object Spectrometer (NICMOS). Follow-up observations using the HST Advanced Camera for Surveys (ACS) and Fine Guidance Sensor 1r (FGS1r) confirm our NICMOS discoveries of companions to the L4.5 dwarf GJ 1001B (LHS 102B) and the M5 dwarf LHS 224, respectively. Images obtained with the Astrophysical Research Consortium 3.5 m telescope...
Source: http://arxiv.org/abs/astro-ph/0406664v2
44
44
Sep 19, 2013
09/13
by
G. K. Miley; R. A. Overzier; A. W. Zirm; H. C. Ford; J. D. Kurk; L. Pentericci; J. P. Blakeslee; M. Franx; G. D. Illingworth; M. Postman; P. Rosati; H. J. A. Rottgering; B. P. Venemans; E. Helder
texts
eye 44
favorite 0
comment 0
We present a deep image of the radio galaxy MRC 1138-262 taken with the Hubble Space Telescope (HST) at a redshift of z = 2.2. The galaxy is known to have properties of a cD galaxy progenitor and be surrounded by a 3 Mpc-sized structure, identified with a protocluster. The morphology shown on the new deep HST/ACS image is reminiscent of a spider's web. More than 10 individual clumpy features are observed, apparently star-forming satellite galaxies in the process of merging with the progenitor...
Source: http://arxiv.org/abs/astro-ph/0610909v1
81
81
Jul 20, 2013
07/13
by
N. L. Homeier; S. Mei; J. P. Blakeslee; M. Postman; B. Holden; H. C. Ford; L. D. Bradley; R. Demarco; M. Franx; G. D. Illingworth; M. J. Jee; F. Menanteau; P. Rosati; A. van der Wel; A. Zirm
texts
eye 81
favorite 0
comment 0
We analyse the cluster color-magnitude relation (CMR) for early-type galaxies in two of the richer clusters in the z ~ 0.9 supercluster system to derive average ages and formation redshifts for the early-type galaxy population. Both clusters were observed with the Advanced Camera for Surveys aboard the {\it Hubble Space Telescope} through the F606W and F814W filters, which brackets the rest-frame 4000 \AA break at the cluster redshifts of z\sim 0.9. We fit the zeropoint and slope of the red...
Source: http://arxiv.org/abs/astro-ph/0604390v2
36
36
Sep 22, 2013
09/13
by
J. P. Blakeslee; B. P. Holden; M. Franx; P. Rosati; R. J. Bouwens; R. Demarco; H. C. Ford; N. L. Homeier; G. D. Illingworth; M. J. Jee; S. Mei; F. Menanteau; G. R. Meurer; M. Postman; K. -V. Tran
texts
eye 36
favorite 0
comment 0
We study the photometric and structural properties of spectroscopically confirmed members in the two massive X-ray--selected z=0.83 galaxy clusters MS1054-03 and RXJ0152-1357 using three-band mosaic imaging with the Hubble Space Telescope Advanced Camera for Surveys. The samples include 105 and 140 members of MS1054-03 and RXJ0152-1357, respectively, with ACS F775W magnitude < 24.0. We develop a promising new structural classification method, based on a combination of the best-fit Sersic...
Source: http://arxiv.org/abs/astro-ph/0603058v1
64
64
Sep 18, 2013
09/13
by
Andrew W. Zirm; R. A. Overzier; G. K. Miley; J. P. Blakeslee; M. Clampin; C. De Breuck; R. Demarco; H. C. Ford; G. F. Hartig; N. Homeier; G. D. Illingworth; A. R. Martel; H. J. A. Rottgering; B. Venemans; the ACS IDT
texts
eye 64
favorite 0
comment 0
We present deep optical imaging of the z=4.1 radio galaxy TN J1338--1942 obtained using the ACS on-board HST. The radio galaxy is known to reside within a large galaxy overdensity (both in physical extent and density contrast). There is good evidence that this `protocluster' region is the progenitor of a present-day rich galaxy cluster. TN J1338 is the dominant galaxy in the protocluster, in terms of size and luminosity and therefore seems destined to evolve into the brightest cluster galaxy....
Source: http://arxiv.org/abs/astro-ph/0505610v1
78
78
Sep 18, 2013
09/13
by
W. L. Freedman; B. F. Madore; B. K. Gibson; L. Ferrarese; D. D. Kelson; S. Sakai; J. R. Mould; R. C. Kennicutt, Jr.; H. C. Ford; J. A. Graham; J. P. Huchra; S. M. G. Hughes; G. D. Illingworth; L. M. Macri; P. B. Stetson
texts
eye 78
favorite 0
comment 0
We present here the final results of the Hubble Space Telescope Key Project to measure the Hubble constant. We summarize our method, the results and the uncertainties, tabulate our revised distances, and give the implications of these results for cosmology. The analysis presented here benefits from a number of recent improvements and refinements, including (1) a larger LMC Cepheid sample to define the fiducial period-luminosity (PL) relations, (2) a more recent HST Wide Field and Planetary...
Source: http://arxiv.org/abs/astro-ph/0012376v1
47
47
Sep 23, 2013
09/13
by
J. P. Blakeslee; K. C. Zekser; N. Benitez; M. Franx; R. L. White; H. C. Ford; R. J. Bouwens; L. Infante; N. J. Cross; G. Hertling; B. P. Holden; G. D. Illingworth; V. Motta; F. Menanteau; G. R. Meurer; M. Postman; P. Rosati; W. Zheng
texts
eye 47
favorite 0
comment 0
We report the discovery of a strongly lensed arc system around a field elliptical galaxy in Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) images of a parallel field observed during NICMOS observations of the HST Ultra-Deep Field. The ACS parallel data comprise deep imaging in the F435W, F606W, F775W, and F850LP bandpasses. The main arc is at a radius of 1.6 arcsec from the galaxy center and subtends about 120 deg. Spectroscopic follow-up at Magellan Observatory yields a...
Source: http://arxiv.org/abs/astro-ph/0312511v1
56
56
Sep 18, 2013
09/13
by
M. J. Jee; H. C. Ford; G. D. Illingworth; R. L. White; T. J. Broadhurst; D. A. Coe; G. R. Meurer; A. Van Der Wel; N. Benitez; J. P. Blakeslee; R. J. Bouwens; L. D. Bradley; R. Demarco; N. L. Homeier; A. R. Martel; S. Mei
texts
eye 56
favorite 0
comment 0
We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024+17 at z~0.4 from ACS data, unifying both strong- and weak-lensing constraints. The weak-lensing signal from a dense distribution of background galaxies (~120 per square arcmin) across the cluster enables the derivation of a high-resolution parameter-free mass map. The strongly-lensed objects tightly constrain the mass structure of the cluster inner region on an absolute scale, breaking the mass-sheet degeneracy....
Source: http://arxiv.org/abs/0705.2171v1
47
47
Sep 18, 2013
09/13
by
Roderik A. Overzier; G. K. Miley; R. J. Bouwens; N. J. G. Cross; A. W. Zirm; N. Benitez; J. P. Blakeslee; M. Clampin; R. Demarco; H. C. Ford; G. F. Hartig; G. D. Illingworth; A. R. Martel; H. J. A. Rottgering; B. Venemans; the ACS IDT
texts
eye 47
favorite 0
comment 0
We present HST/ACS observations of the most distant radio galaxy known, TN J0924-2201 at z=5.2. This radio galaxy has 6 spectroscopically confirmed Lya emitting companion galaxies, and appears to lie within an overdense region. The radio galaxy is marginally resolved in i_775 and z_850 showing continuum emission aligned with the radio axis, similar to what is observed for lower redshift radio galaxies. Both the half-light radius and the UV star formation rate are comparable to the typical...
Source: http://arxiv.org/abs/astro-ph/0509308v1
44
44
Sep 24, 2013
09/13
by
N. L. Homeier; R. Demarco; P. Rosati; M. Postman; J. P. Blakeslee; R. J. Bouwens; L. D. Bradley; H. C. Ford; T. Goto; C. Gronwall; B. Holden; G. D. Illingworth; M. J. Jee; A. R. Martel; S. Mei; F. Menanteau; A. Zirm; M. Clampin; G. F. Hartig; the ACS Team
texts
eye 44
favorite 0
comment 0
We combine imaging data from the Advanced Camera for Surveys (ACS) with VLT/FORS optical spectroscopy to study the properties of star-forming galaxies in the z=0.837 cluster CL0152-1357. We have morphological information for 24 star-forming cluster galaxies, which range in morphology from late-type and irregular to compact early-type galaxies. We find that while most star-forming galaxies have $r_{625}-i_{775}$ colors bluer than 1.0, eight are in the red cluster sequence. Among the star-forming...
Source: http://arxiv.org/abs/astro-ph/0412083v1
49
49
Sep 22, 2013
09/13
by
Alessandro Rettura; S. Mei; S. A. Stanford; A. Raichoor; S. Moran; B. Holden; P. Rosati; R. Ellis; F. Nakata; M. Nonino; T. Treu1; J. P. Blakeslee1; R. Demarco; P. Eisenhardt; H. C. Ford; R. A. E. Fosbury; G. Illingworth; M. Huertas-Company; M. J. Jee; T. Kodama; M. Postman; M. Tanaka; R. L. White
texts
eye 49
favorite 0
comment 0
We study the environmental dependence of stellar population properties at z ~ 1.3. We derive galaxy properties (stellar masses, ages and star formation histories) for samples of massive, red, passive early-type galaxies in two high-redshift clusters, RXJ0849+4452 and RXJ0848+4453 (with redshifts of z = 1.26 and 1.27, respectively), and compare them with those measured for the RDCS1252.9-2927 cluster at z=1.24 and with those measured for a similarly mass-selected sample of field contemporaries...
Source: http://arxiv.org/abs/1103.0265v1
55
55
Sep 23, 2013
09/13
by
M. J. Jee; K. S. Dawson; H. Hoekstra; S. Perlmutter; P. Rosati; M. Brodwin; N. Suzuki; B. Koester; M. Postman; L. Lubin; J. Meyers; S. A. Stanford; K. Barbary; F. Barrientos; P. Eisenhardt; H. C. Ford; D. G. Gilbank; M. D. Gladders; A. Gonzalez; D. W. Harris; X. Huang; C. Lidman; E. S. Rykoff; D. Rubin; A. L. Spadafora
texts
eye 55
favorite 0
comment 0
We present weak gravitational lensing analysis of 22 high-redshift (z >~1) clusters based on Hubble Space Telescope images. Most clusters in our sample provide significant lensing signals and are well detected in their reconstructed two-dimensional mass maps. Combining the current results and our previous weak-lensing studies of five other high-z clusters, we compare gravitational lensing masses of these clusters with other observables. We revisit the question whether the presence of the...
Source: http://arxiv.org/abs/1105.3186v2
38
38
Sep 22, 2013
09/13
by
J. P. Blakeslee; M. Franx; M. Postman; P. Rosati; B. P. Holden; G. D. Illingworth; H. C. Ford; N. J. G. Cross; C. Gronwall; N. Benitez; R. J. Bouwens; T. J. Broadhurst; M. Clampin; R. Demarco; D. A. Golimowski; G. F. Hartig; L. Infante; A. R. Martel; G. K. Miley; F. Menanteau; G. R. Meurer; M. Sirianni; R. L. White
texts
eye 38
favorite 0
comment 0
We investigate the color-magnitude (CM) relation of galaxies in the distant X-ray selected cluster RDCS1252.9-2927 at z=1.24 using images obtained with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope in the F775W and F850LP bandpasses. We select galaxies based on morphological classifications extending about 3.5 mag down the galaxy luminosity function, augmented by spectroscopic membership information. At the core of the cluster is an extensive early-type galaxy population...
Source: http://arxiv.org/abs/astro-ph/0309036v1
75
75
Sep 19, 2013
09/13
by
R. Demarco; P. Rosati; C. Lidman; M. Girardi; M. Nonino; A. Rettura; V. Strazzullo; A. van der Wel; H. C. Ford; V. Mainieri; B. P. Holden; S. A. Stanford; J. P. Blakeslee; R. Gobat; M. Postman; P. Tozzi; R. A. Overzier; A. W. Zirm; N. Benitez; N. L. Homeier; G. D. Illingworth; L. Infante; M. J. Jee; S. Mei; F. Menanteau; V. Motta; W. Zheng; M. Clampin; G. Hartig
texts
eye 75
favorite 0
comment 0
We present results from an extensive spectroscopic survey, carried out with VLT FORS, and from an extensive multiwavelength imaging data set from the HST Advanced Camera for Surveys and ground based facilities, of the cluster of galaxies RDCS J1252.9-2927. We have spectroscopically confirmed 38 cluster members in the redshift range 1.22 < z < 1.25. A cluster median redshift of z=1.237 and a rest-frame velocity dispersion of 747^{+74}_{-84} km/s are obtained. Using the 38 confirmed...
Source: http://arxiv.org/abs/astro-ph/0703153v2
42
42
Sep 18, 2013
09/13
by
L. M. Macri; J. P. Huchra; P. B. Stetson; N. A. Silbermann; W. L. Freedman; R. C. Kennicutt; J. R. Mould; B. F. Madore; F. Bresolin; L. Ferrarese; H. C. Ford; J. A. Graham; B. K. Gibson; M. Han; P. Harding; R. J. Hill; J. G. Hoessel; S. M. G. Hughes; D. D. Kelson; G. D. Illingworth; R. L. Phelps; C. F. Prosser; D. M. Rawson; A. Saha; S. Sakai; A. Turner
texts
eye 42
favorite 0
comment 0
We report on the discovery of Cepheids in the Virgo spiral galaxy NGC 4535, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope. NGC 4535 is one of 18 galaxies observed as a part of The HST Key Project on the Extragalactic Distance Scale which aims to measure the Hubble constant to 10% accuracy. NGC 4535 was observed over 13 epochs using the F555W filter, and over 9 epochs using the F814W filter. The HST F555W and F814W data were transformed...
Source: http://arxiv.org/abs/astro-ph/9901332v1
43
43
Sep 21, 2013
09/13
by
G. R. Meurer; J. P. Blakeslee; M. Sirianni; H. C. Ford; G. D. Illingworth; N. Benitez; M. Clampin; F. Menanteau; H. D. Tran; R. A. Kimble; G. F. Hartig; D. R. Ardila; F. Bartko; R. J. Bouwens; T. J. Broadhurst; R. A. Brown; C. J. Burrows; E. S. Cheng; N. J. G. Cross; P. D. Feldman; D. A. Golimowski; C. Gronwall; L. Infante; J. E. Krist; M. P. Lesser; A. R. Martel; G. K. Miley; M. Postman; P. Rosati; W. B. Sparks; Z. I. Tsvetanov; R. L. White; W. Zheng
texts
eye 43
favorite 0
comment 0
We have discovered three globular clusters beyond the Holmberg radius in Hubble Space Telescope Advanced Camera for Surveys images of the gas-rich dark matter dominated blue compact dwarf galaxy NGC2915. The clusters, all of which start to resolve into stars, have M_{V606} = -8.9 to -9.8 mag, significantly brighter than the peak of the luminosity function of Milky Way globular clusters. Their colors suggest a metallicity [Fe/H] ~ -1.9 dex, typical of metal-poor Galactic globular clusters. The...
Source: http://arxiv.org/abs/astro-ph/0311323v1
64
64
Sep 20, 2013
09/13
by
F. Menanteau; H. C. Ford; G. D. Illingworth; M. Sirianni; J. P. Blakeslee; G. R. Meurer; A. R. Martel; N. Benitez; M. Postman; M. Franx; D. R. Ardila; F. Bartko; R. J. Bouwens; T. J. Broadhurst; R. A. Brown; C. J. Burrows; E. S. Cheng; M. Clampin; N. J. G. Cross; P. D. Feldman; D. A. Golimowski; C. Gronwall; G. F. Hartig; L. Infante; R. A. Kimble; J. E. Krist; M. P. Lesser; G. K. Miley; P. Rosati; W. B. Sparks; H. D. Tran; Z. I. Tsvetanov; R. L. White W. Zheng
texts
eye 64
favorite 0
comment 0
(Abridged) We study the internal color properties of a morphologically selected sample of spheroidal galaxies taken from HST/ACS ERO program of UGC 10214 (``The Tadpole''). By taking advantage of the unprecedented high resolution of the ACS in this very deep dataset we are able to characterize spheroids at sub-arcseconds scales. Using the V_606W and I_814W bands, we construct V-I color maps and extract color gradients for a sample of spheroids at I_814W < 24 mag. We investigate the existence...
Source: http://arxiv.org/abs/astro-ph/0405326v2
