77
77
Sep 24, 2013
09/13
by
L. Infante
texts
eye 77
favorite 0
comment 0
Faint star number counts in the photographic \jmag band and \bvcol colour distributions are presented for a 1.08 deg$^2$ field near the North Galactic Pole. Due to the excellent star/galaxy discrimination we count stars as faint as \jmag = 23. We compare the number counts and colour distributions in 5 adjacent fields near SA57. The number counts and colour distributions are in very good agreement with previous data. However, we find that the large field-to-field scatter in the colour...
Source: http://arxiv.org/abs/astro-ph/9408073v1
64
64
Sep 24, 2013
09/13
by
L. Infante; C. J. Pritchet
texts
eye 64
favorite 0
comment 0
The two-point angular correlation function of galaxies, \wte, has been computed from a new survey of faint galaxies covering a 2 deg$^2$ area near the North Galactic Pole. This survey, which is complete to limiting magnitudes \jmag=24 and \fmag=23, samples angular scales as large as $1\degpoint5$. Faint galaxies are found to be more weakly clustered (by a factor of at least two) compared to galaxies observed locally. Clustering amplitudes are closer to model predictions in the red than in the...
Source: http://arxiv.org/abs/astro-ph/9408071v1
61
61
Sep 18, 2013
09/13
by
S. Mieske; M. Hilker; L. Infante
texts
eye 61
favorite 0
comment 0
The surface brightness fluctuation (SBF) method is a powerful tool to derive distances to galaxies for which single stars cannot be resolved. Up to now, the method has been calibrated mainly at red colours due to the intrinsic faintness of blue early-type galaxies. In this paper we address the I-band calibration of the SBF method at blue colours, the regime of dwarf elliptical galaxies (dEs). We present deep and wide-field VI photometry of the central Fornax cluster obtained at Las Campanas...
Source: http://arxiv.org/abs/astro-ph/0605660v1
52
52
Sep 20, 2013
09/13
by
S. Mieske; M. Hilker; L. Infante
texts
eye 52
favorite 0
comment 0
The potential of the Surface Brightness Fluctuation (SBF) method to determine distances to dwarf ellipticals in nearby clusters is investigated. We find that for the Fornax cluster, the SBF method yields reliable results down to very faint magnitudes, in our case down to M_V ~- 11 mag when observing for about 1 hour at good seeing with an 8m-class telescope in the I-filter. Comparison between real and simulated data for the Centaurus Cluster shows that our simulations do not overestimate the...
Source: http://arxiv.org/abs/astro-ph/0301446v1
46
46
Sep 19, 2013
09/13
by
S. Mieske; M. Hilker; L. Infante
texts
eye 46
favorite 0
comment 0
The potential of the Surface Brightness Fluctuations (SBF) method to determine the membership of dwarf elliptical galaxies (dEs) in nearby galaxy clusters is investigated. Extensive simulations for SBF measurements on dEs in the I-band for various combinations of distance modulus, seeing and integration time are presented, based on average VLT FORS1 and FORS2 zero points. These show that for distances up to 20 Mpc (Fornax or Virgo cluster distance), reliable membership determination of dEs can...
Source: http://arxiv.org/abs/astro-ph/0303577v2
35
35
Sep 18, 2013
09/13
by
M. Hilker; S. Mieske; L. Infante
texts
eye 35
favorite 0
comment 0
In this contribution, we report on the discovery of dwarf spheroidals (dSphs) in the core of the Fornax cluster. Their photometric properties -- like magnitude, colour, surface brightness -- are very similar to those of Local Group dSphs. However, at a given total magnitude, dSphs in Fornax seem to be more extended than their Local Group counterparts. The membership of several dwarf galaxy candidates in Fornax has been confirmed by surface brightness fluctuation measurements on deep wide-field...
Source: http://arxiv.org/abs/astro-ph/0505186v1
65
65
Jul 20, 2013
07/13
by
J. Chaname; L. Infante; A. Reisenegger
texts
eye 65
favorite 0
comment 0
NGC 1427A is a LMC-like irregular galaxy in the Fornax cluster with an extended pattern of strong star formation around one of its edges, which is probably due to some kind of interaction with the cluster environment. We present H-alpha velocities within NGC 1427A, obtained through long-slit spectroscopy at seven different positions, chosen to fall on the brightest HII regions of the galaxy. Due to its location very near the center of the cluster this object is an excellent candidate to study...
Source: http://arxiv.org/abs/astro-ph/9910355v1
47
47
Sep 18, 2013
09/13
by
S. Mieske; M. Hilker; L. Infante
texts
eye 47
favorite 0
comment 0
We review some properties of ultracompact dwarf galaxies (UCDs) in Fornax and of their brighter counterparts in Abell 1689, among which are two M32 twins, and discuss various possible UCD formation scenarios. We note that it is indispensable to carefully take into account the bright end of the globular cluster luminosity function when estimating the number density of UCDs. It is suggested that the search for more luminous UCDs in dense and rich galaxy clusters is the best way towards...
Source: http://arxiv.org/abs/astro-ph/0505187v1
50
50
Sep 18, 2013
09/13
by
S. Mieske; M. Hilker; L. Infante
texts
eye 50
favorite 0
comment 0
The results of the Fornax Compact Object Survey (FCOS) are presented. The FCOS aims at investigating the nature of the Ultra Compact Dwarf galaxies (UCDs) recently discovered in the center of the Fornax cluster (Drinkwater et al. 2000). 280 unresolved objects in the magnitude space covering UCDs and bright globular clusters (1820 mag) at 96% confidence. The mean velocity of the bright compact objects is consistent with that of the dwarf galaxy population in Fornax, but inconsistent with that of...
Source: http://arxiv.org/abs/astro-ph/0401610v1
63
63
Sep 21, 2013
09/13
by
M. Hilker; L. Infante; T. Richtler
texts
eye 63
favorite 0
comment 0
In this paper we briefly review the properties of the dwarf galaxy population at the core of the Fornax cluster, as well as the properties of the extraordinary rich globular cluster system and the cD halo around the central galaxy NGC 1399. In turn, the question whether a scenario in which dwarf galaxies have been accreted and dissolved in the cluster center can explain the observed properties is addressed. The possibility of accretion of a certain number of dwarf galaxies, the stripping of...
Source: http://arxiv.org/abs/astro-ph/9905112v1
83
83
Sep 19, 2013
09/13
by
M. J. Way; H. Quintana; L. Infante
texts
eye 83
favorite 0
comment 0
A dynamical analysis of the structure of the clusters of galaxies Abell 119 and Abell 133 is presented, using new redshift data combined with existing data from the literature. We compare our results with those from the X-ray data for these clusters, and with those from radio data for the central cD galaxy in each cluster. A comparison of the mass estimate based on X-ray data and that obtained here after subgroups are eliminated shows them to be comparable. After the elimination of subgroups,...
Source: http://arxiv.org/abs/astro-ph/9709036v1
48
48
Sep 23, 2013
09/13
by
L. Infante; D. F. de Mello; F. Menanteau
texts
eye 48
favorite 0
comment 0
The 2-point angular correlation function of galaxies, \wt, has been computed on equatorial fields observed with the CTIO 4m prime focus, within a total area of 2.31 deg$^2$. In the magnitude range $19\le m_R \le 21.5$, corresponding to $\approx 0.35$, we find an excess of power in \wt at scales $2''\le\theta \le6''$ over what would be expected from an extrapolation of \wt measured at larger $\theta$. The significance of this excess is $\approx 5\sigma$. At larger scales, $6'' < \theta \le...
Source: http://arxiv.org/abs/astro-ph/9608037v1
32
32
Sep 19, 2013
09/13
by
E. R. Carrasco; C. Mendes de Oliveira; L. Infante
texts
eye 32
favorite 0
comment 0
We present the photometric and spectroscopic results of a survey done in a wide-field area of nearby groups and poor clusters. The main goals are identifying and characterizing the properties of low-surface-brightness dwarf galaxies and determining the galaxy luminosity function for Mv>-13. We surveyed areas (typically 0.1--1.0 square degrees) of the groups NGC 6868 (Telescopium), NGC 5846, HCG 42, Hydra I, Dorado and the poor clusters IC 4765 in V and I. In this work we present the results...
Source: http://arxiv.org/abs/astro-ph/0303433v1
101
101
Jul 22, 2013
07/13
by
A. Orsi; C. G. Lacey; C. M. Baugh; L. Infante
texts
eye 101
favorite 0
comment 0
We combine a semi-analytical model of galaxy formation with a very large simulation which follows the growth of large scale structure in a LambdaCDM universe to predict the clustering of Ly-alpha emitters. We find that the clustering strength of Ly-alpha emitters has only a weak dependence on Ly-alpha luminosity but a strong dependence on redshift. With increasing redshift, Ly-alpha emitters trace progressively rarer, higher density regions of the universe. Due to the large volume of the...
Source: http://arxiv.org/abs/0807.3447v4
57
57
Sep 22, 2013
09/13
by
F. Hammer; N. Gruel; T. Thuan; H. Flores; L. Infante
texts
eye 57
favorite 0
comment 0
VLT spectra of 14 luminous compact galaxies (LCGs) reveal strong metallic absorption line sytems as well as narrow and intense emission lines. Their gas extinction is found to be large (Av ~ 1.5 mag) leading to an upward revision of their star formation rate (SFR) to an average value of ~ 40 Mo/yr. Large extinction values are also supported by the large rate of detection in one field observed by ISO. Gas metal abundances in LCGs have about half the solar value. We argue that LCGs are the...
Source: http://arxiv.org/abs/astro-ph/0011218v1
42
42
Sep 18, 2013
09/13
by
T. Richtler; B. Dirsch; S. Larsen; M. Hilker; L. Infante
texts
eye 42
favorite 0
comment 0
We present 8 bright globular clusters and/or objects of less familiar nature which we found in the course of scrutinizing the globular cluster system of NGC 1399. These objects are morphologically striking, either by their sizes or by other structural properties. Some of them may be candidates for stripped dwarf galaxy nuclei, emphasizing the possible role of accretion in the NGC 1399 cluster system. They are all highly interesting targets for further deep spectroscopy or HST-imaging. Since...
Source: http://arxiv.org/abs/astro-ph/0505320v1
50
50
Sep 21, 2013
09/13
by
R. E. Gonzalez; N. D. Padilla; G. Galaz; L. Infante
texts
eye 50
favorite 0
comment 0
We present a study on the variations of the luminosity function of galaxies around clusters in a numerical simulation with semi-analytic galaxies, attempting to detect these variations in the 2dF Galaxy Redshift Survey. We subdivide the simulation box in equal-density regions around clusters, which we assume can be achieved by selecting objects at a given normalised distance ($r/r_{rms}$, where $r_{rms}$ is an estimate of the halo radius) from the group centre. The semi-analytic model predicts...
Source: http://arxiv.org/abs/astro-ph/0508220v1
40
40
Sep 19, 2013
09/13
by
S. Mieske; M. Hilker; L. Infante; C. Mendes de Oliveira
texts
eye 40
favorite 0
comment 0
AIMS: We analyse the photometric properties of the early-type Fornax cluster dwarf galaxy population, based on a wide field imaging study of the central cluster area in V and I. We used the instrument/telescope combination IMACS/Magellan at Las Campanas Observatory, providing much larger light collecting area and better image resolution than previous surveys. METHODS: We create a fiducial sample of Fornax cluster dwarf ellipticals (dEs) in the following three steps: (1) To verify cluster...
Source: http://arxiv.org/abs/astro-ph/0610516v1
74
74
Sep 22, 2013
09/13
by
M. Hilker; D. J. Bomans; L. Infante; M. Kissler-Patig
texts
eye 74
favorite 0
comment 0
We have discovered that the Fornax irregular galaxy NGC 1427A is in very many respects a twin of the Large Magellanic Cloud. Based on B, V, I, and H alpha images, we find the following. The light of the galaxy is dominated by high surface brightness regions in the south-west that are superimposed by a half-ring of OB associations and H II regions indicating recent star formation. The colors of the main stellar body are (V-I) = 0.8 mag and (B-V) = 0.4 mag, comparable to the LMC colors. A low...
Source: http://arxiv.org/abs/astro-ph/9707151v1
39
39
Sep 22, 2013
09/13
by
M. Hilker; M. Kissler-Patig; T. Richtler; L. Infante; H. Quintana
texts
eye 39
favorite 0
comment 0
We present a photometric catalog (based on V and I photometry) of galaxies in the central regions of the Fornax galaxy cluster. Our 11 CCD fields cover 0.17 degrees in total. The limiting surface brightness is around 24 mag arsec^-2, similar to that of Ferguson's (1989, AJ 98, 367) catalog, whereas our limiting total magnitude is around V = 22 mag, about two magnitudes fainter. It is the surface brightness limit, however, that prevents us from detecting the counterparts of the faintest Local...
Source: http://arxiv.org/abs/astro-ph/9807143v1
37
37
Sep 19, 2013
09/13
by
C. Mendes de Oliveira; E. R. Carrasco; L. Infante; M. Bolte
texts
eye 37
favorite 0
comment 0
We are undertaking a large, wide-field survey of nearby groups and poor clusters. The main goals are identifying and characterizing the properties of low-surface-brightness dwarf galaxies and determining the galaxy luminosity function for M$_R > -17$. Large areas (typically 0.3--0.5 degree$^2$ per system but up to 7 degree$^2$) of the groups Telescopium, Leo I, Dorado, N5575, HCG 42, HCG 44, HCG 68 and the poor clusters IC 4765 and Hydra have so far been surveyed in V and I. We present the...
Source: http://arxiv.org/abs/astro-ph/0010266v1
50
50
Sep 22, 2013
09/13
by
M. Hilker; L. Infante; G. Vieria; M. Kissler-Patig; T. Richtler
texts
eye 50
favorite 0
comment 0
Radial velocities of 94 galaxies brighter than about V_tot = 20 mag in the direction of the central Fornax cluster have been measured. Except for 8 Fornax members, all galaxies lie in the background. Among the 8 members, there are 5 nucleated dwarf ellipticals that are already listed in the FCC (Ferguson 1989, AJ 98, 367). Two of the 3 ``new'' members are very compact and have surface brightnesses comparable to globular clusters, however their luminosities are in the range of dwarf elliptical...
Source: http://arxiv.org/abs/astro-ph/9807144v1
55
55
Sep 21, 2013
09/13
by
S. Mieske; M. Hilker; A. Jordan; L. Infante; M. Kissler-Patig
texts
eye 55
favorite 0
comment 0
Aim: To extend the investigations of ultra-compact dwarf galaxies (UCDs) beyond the well studied Fornax and Virgo clusters. Methods: We measured spectroscopic redshifts of about 400 compact object candidates with 19.2 < V < 22.4 mag in the central region of the Centaurus galaxy cluster (d=43Mpc), using VIMOS@VLT. The luminosity range of the candidates covers that of bright globular clusters (GCs) and of UCDs in Fornax and Virgo. Results: We confirm the cluster membership of 27 compact...
Source: http://arxiv.org/abs/0706.2724v1
56
56
Sep 20, 2013
09/13
by
M. Hilker; H. Baumgardt; L. Infante; M. Drinkwater; E. Evstigneeva; M. Gregg
texts
eye 56
favorite 0
comment 0
Aims. We determine masses and mass-to-light ratios of five ultra-compact dwarf galaxies and one dwarf elliptical nucleus in the Fornax cluster from high resolution spectroscopy. Methods. Velocity dispersions were derived from selected wavelength regions using a direct-fitting method. To estimate the masses of the UCDs a new modelling program has been developed that allows a choice of different representations of the surface brightness profile (i.e. Nuker, Sersic or King laws) and corrects the...
Source: http://arxiv.org/abs/astro-ph/0612484v1
45
45
Sep 18, 2013
09/13
by
M. J. Way; H. Quintana; L. Infante; D. G. Lambas; H. Muriel
texts
eye 45
favorite 0
comment 0
The Southern Abell Redshift Survey contains 39 clusters of galaxies with redshifts in the range 0.0 < z < 0.31 and a median redshift depth of z = 0.0845. SARS covers the region 0 < decl < -65 deg, R.A. < 5h, R.A. > 21h (while avoiding the LMC and SMC) with b > 40. Cluster locations were chosen from the Abell and Abell-Corwin-Olowin catalogs while galaxy positions were selected from the Automatic Plate Measuring Facility galaxy catalog with extinction-corrected magnitudes in...
Source: http://arxiv.org/abs/astro-ph/0509736v1
56
56
Sep 20, 2013
09/13
by
L. Infante; J. Varela; M. Moles; G. Hertling; A. Garcia; F. Menanteau
texts
eye 56
favorite 0
comment 0
We test the hypothesis whether high redshift QSOs would preferentially appear in small groups or pairs, and if they are associated with massive, young clusters. We carried out a photometric search for \Ly emitters on scales $\lesssim 10 h^{-1}$ Mpc, in the fields of a sample of 47 $z\approx3$ known QSOs. Wide and narrow band filter color-magnitude diagrams were generated for each of the $6'.6\times6'.6$ fields. A total of 13 non resolved objects with a significant color excess were detected as...
Source: http://arxiv.org/abs/astro-ph/0301366v1
127
127
Sep 24, 2013
09/13
by
L. Infante; P Fouque; G. Hertling; M. J. Way; E. Giraud; H. Quintana
texts
eye 127
favorite 0
comment 0
We present magnitudes and redshifts of galaxies in the cluster of galaxies CL0017-20 and in the double cluster CL0500-24. Luminosity functions and velocity distributions have been derived. CL0017-20 possesses a virial mass of $2.9 \times 10^{14}$ M$_\odot$ and a \vmag band luminosity of $2.3 \pm 0.5 \times 10^{12}$ L$_\odot$ ($M/L_{\rm V} = 127$), much of it in a very compact core of size 113 kpc. Our new velocities and photometry of CL0500-24 confirm its double nature. Our group algorithm...
Source: http://arxiv.org/abs/astro-ph/9408072v1
53
53
Sep 23, 2013
09/13
by
M. Kissler-Patig; S. Kohle; M. Hilker; T. Richtler; L. Infante; H. Quintana
texts
eye 53
favorite 0
comment 0
We studied the properties of the globular cluster systems of five early--type galaxies in the Fornax galaxy cluster: NGC 1374, NGC 1379, NGC 1387, NGC 1427, and the central giant elliptical NGC 1399. From the investigation of their number of globular clusters, specific frequency, color distribution, surface density profile, and spatial distribution, we conclude that our faint ellipticals have no more globular clusters than spirals of the same mass, and neither differ in their other properties....
Source: http://arxiv.org/abs/astro-ph/9608082v1
130
130
Sep 22, 2013
09/13
by
S. Mieske; M. Hilker; I. Misgeld; A. Jordan; L. Infante; M. Kissler-Patig
texts
eye 130
favorite 0
comment 0
We recently initiated a search for ultra-compact dwarf galaxies (UCDs) in the Centaurus galaxy cluster (Mieske et al. 2007), resulting in the discovery of 27 compact objects with -12.2
Source: http://arxiv.org/abs/0901.4919v1
120
120
Sep 18, 2013
09/13
by
Sven Kohle; Markus Kissler-Patig; Michael Hilker; Tom Richtler; L. Infante; H. Quintana
texts
eye 120
favorite 0
comment 0
We present Globular Cluster Luminosity Functions for four ellipticals and one S0-Galaxy in the Fornax cluster of galaxies, derived from CCD photometry in V and I. The averaged turnover magnitudes are $V_{TO} = 23.80 \pm 0.06$ and $I_{TO} =22.39 \pm 0.05$, respectively. We derive a relative distance modulus $(m-M)_{Fornax} - (m-M)_{M87} = 0.08 \pm 0.09$ mag using the turnover of M87 based on HST data.
Source: http://arxiv.org/abs/astro-ph/9604036v1
42
42
Sep 24, 2013
09/13
by
V. Coenda; C. J. Donzelli; H. Muriel; H. Quintana; L. Infante; D. G. Lambas
texts
eye 42
favorite 0
comment 0
We have analyzed CCD images of 14 Abell clusters in the R filter of the SARS survey (Way et al 2004), with cz
Source: http://arxiv.org/abs/astro-ph/0412434v1
50
50
Sep 20, 2013
09/13
by
V. Coenda; H. Muriel; C. J. Donzelli; H. Quintana; L. Infante; D. G. Lambas
texts
eye 50
favorite 0
comment 0
We analyze photometric properties of 1384 cluster galaxies as a function of the normalized distance to cluster center. These galaxies were selected in the central region ($r/r_{200} \leq$ 0.8) of 14 southern Abell clusters chosen from the Southern Abell Cluster Redshifts Survey (SARS). For 507 of these galaxies we also obtained their luminosity profiles. We have studied the morphology-clustercentric distance relation on the basis of the shape parameter $n$ of the S\'ersic's law. We also have...
Source: http://arxiv.org/abs/astro-ph/0601085v1
52
52
Sep 21, 2013
09/13
by
M. J. Frank; M. Hilker; S. Mieske; H. Baumgardt; E. K. Grebel; L. Infante
texts
eye 52
favorite 0
comment 0
We present the internal kinematics of UCD3, the brightest known ultra-compact dwarf galaxy (UCD) in the Fornax cluster, making this the first UCD with spatially resolved spectroscopy. Our study is based on seeing-limited observations obtained with the ARGUS Integral Field Unit of the VLT/FLAMES spectrograph under excellent seeing conditions (0.5 - 0.67 arcsec FWHM). The velocity field of UCD3 shows the signature of weak rotation, comparable to that found in massive globular clusters. Its...
Source: http://arxiv.org/abs/1104.2593v1
62
62
Sep 18, 2013
09/13
by
A. V. Smith Castelli; L. P. Bassino; T. Richtler; S. A. Cellone; C. Aruta; L. Infante
texts
eye 62
favorite 0
comment 0
We present the first colour-magnitude relation (CMR) of early-type galaxies in the central region of the Antlia cluster, obtained from CCD wide-field photometry in the Washington photometric system. Integrated (C -T1) colours, T1 magnitudes, and effective radii have been measured for 93 galaxies (i.e. the largest galaxies sample in the Washington system till now) from the FS90 catalogue (Ferguson & Sandage 1990). Membership of 37 objects can be confirmed through new radial velocities and...
Source: http://arxiv.org/abs/0803.1630v1
114
114
Jul 20, 2013
07/13
by
P. Tummuangpak; T. Shanks; R. Bielby; N. H. M. Crighton; H. Francke; L. Infante; T. Theuns
texts
eye 114
favorite 0
comment 0
We use observations and simulations to study the relationship between star-forming galaxies and the IGM at z~3. We use redshift data taken from the VLT LBG Redshift Survey (VLRS) and Keck surveys in fields centred on bright background QSOs, whilst the simulated data is taken from GIMIC. In the simulations, we find that the dominant peculiar velocities are in the form of large-scale coherent motions of gas and galaxies. Gravitational infall of galaxies towards each other is also seen, consistent...
Source: http://arxiv.org/abs/1304.4598v1
60
60
Sep 24, 2013
09/13
by
S. Mieske; L. Infante; M. Hilker; G. Hertling; J. P. Blakeslee; N. Benitez; H. Ford; K. Zekser
texts
eye 60
favorite 0
comment 0
The M31 satellite galaxy M32 has long been considered an object of unique properties, being the most extreme example of the very rare compact elliptical galaxy class. Here we present the spectroscopic discovery of two M32 twins in the massive galaxy cluster Abell 1689. As these objects are so rare, this is an important step towards a better understanding of the nature of compact galaxies. The two M32 twins had first been detected within our photometric search for ultra compact dwarf galaxy...
Source: http://arxiv.org/abs/astro-ph/0412263v1
50
50
Sep 22, 2013
09/13
by
A. V. Smith Castelli; L. P. Bassino; S. A. Cellone; T. Richtler; B. Dirsch; L. Infante; C. Aruta; M. Gómez
texts
eye 50
favorite 0
comment 0
We present the first results of a project aimed to study the galaxy population of the Antlia cluster, the third nearest galaxy cluster after Virgo and Fornax. The observations for the Antlia project consist of Washington wide-field images taken with the MOSAIC camera mounted at the prime focus of the CTIO 4-m Blanco telescope. Our preliminary results correspond to the identification and classification of dwarf galaxies in the central cluster region, extending the list of Ferguson & Sandage...
Source: http://arxiv.org/abs/astro-ph/0603391v1
86
86
Sep 22, 2013
09/13
by
W. P. Gieren; M. Gomez; J. Storm; T. J. Moffett; L. Infante; T. G. Barnes III; D. Geisler; P. Fouque
texts
eye 86
favorite 0
comment 0
We report BV(RI)c CCD photometric data for a group of seven Cepheid variables in the young, rich cluster NGC 1866 in the Large Magellanic Cloud. The photometry was obtained as part of a program to determine accurate distances to these Cepheids by means of the infrared surface brightness technique, and to improve the LMC Cepheid database for constructing Cepheid PL and PLC relations. Using the new data together with data from the literature, we have determined improved periods for all variables....
Source: http://arxiv.org/abs/astro-ph/0003240v1
11
11
Jun 25, 2018
06/18
by
R. M. Bielby; P. Tummuangpak; T. Shanks; H. Francke; N. H. M. Crighton; E. Bañados; Jorge González-López; L. Infante; A. Orsi
texts
eye 11
favorite 0
comment 0
We present a survey of $z\sim3$ Ly$\alpha$ emitters (LAEs) within the fields of the VLT LBG Redshift Survey. The data encompasses 5 independent survey fields co-spatial with spectroscopic LBG data and covering a larger total area than previously analysed for LAE number counts and clustering. This affords an improved analysis over previous work by minimising the effects of cosmic variance and allowing the cross-clustering analysis of LAEs and LBGs. Our photometric sample consists of $\approx600$...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1501.01215
47
47
Sep 22, 2013
09/13
by
S. Mieske; A. Jordan; P. Cote; E. Peng; L. Ferrarese; J. Blakeslee; S. Mei; H. Baumgardt; J. Tonry; L. Infante; M. West
texts
eye 47
favorite 0
comment 0
We investigate the color-magnitude relation for globular clusters (GCs) -- the so-called "blue tilt" -- detected in the ACS Fornax Cluster Survey and using the combined sample of GCs from the ACS Fornax and Virgo Cluster Surveys. We find a tilt of gamma_z=d(g-z)/dz=-0.0257 +- 0.0050 for the full GC sample of the Fornax Cluster Survey (~5800 GCs). This is slightly shallower than the value gamma_z=-0.0459 +- 0.0048 found for the Virgo Cluster Survey GC sample (~11100 GCs). The slope for...
Source: http://arxiv.org/abs/1001.2769v1
7
7.0
Jun 30, 2018
06/18
by
N. Laporte; A. Streblyanska; S. Kim; R. Pelló; F. E. Bauer; D. Bina; G. Brammer; M. A. De Leo; L. Infante; I. Pérez-Fournon
texts
eye 7
favorite 0
comment 0
(Abridged) The HST Frontier Fields project started at the end of 2013 with the aim of providing extremely deep images of 6 massive galaxy clusters. One of the main goals of this program is to push several telescopes to their limits in order to provide the best current view of the earliest stages of the Universe. We present a detailed analysis of $z$$\sim$8 objects behind the HFFs lensing cluster, MACS0416-2403, combining 0.3-1.6 $\mu$m imaging from HST, ground-based $K_s$ imaging from VLT...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1412.1089
112
112
Sep 17, 2013
09/13
by
T. Richtler; B. Dirsch; D. Geisler; K. Gebhardt; M. Hilker; L. Infante; D. Minniti; M. Rejkuba; J. C. Forte; S. Larsen; E. K. Grebel; V. Alonso
texts
eye 112
favorite 0
comment 0
We performed spectroscopy of globular clusters associated with NGC 1399 and measured radial velocities of more than 400 clusters, the largest sample ever obtained for dynamical studies. In this progress report, we present the sample and the first preliminary results. Red and blue clusters have slightly different velocity dispersions in accordance with their different density profiles. Their velocity dispersions remain constant with radial distance, which differs from earlier work.
Source: http://arxiv.org/abs/astro-ph/0108140v1
99
99
Sep 18, 2013
09/13
by
T. Richtler; B. Dirsch; K. Gebhardt; D. Geisler; M. Hilker; M. V. Alonso; J. C. Forte; E. K. Grebel; L. Infante; S. Larsen; D. Minniti; M. Rejkuba
texts
eye 99
favorite 0
comment 0
We study the kinematics and dynamics of the globular cluster system of NGC 1399, the central galaxy of the Fornax cluster. The observational data consists of medium resolution spectra, obtained at the Very Large Telescope. Our sample comprises 468 radial velocities in the magnitude range 20 < m_R < 23. This is the largest sample of globular cluster velocities around any galaxy obtained so far. The radial range is 2 arcmin < r < 9 arcmin, corresponding to 11 kpc to 50 kpc of...
Source: http://arxiv.org/abs/astro-ph/0401175v1
86
86
Sep 18, 2013
09/13
by
B. Dirsch; T. Richtler; D. Geisler; K. Gebhardt; M. Hilker; M. V. Alonso; J. C. Forte; E. K. Grebel; L. Infante; S. Larsen; D. Minniti; M. Rejkuba
texts
eye 86
favorite 0
comment 0
Radial velocities of 468 globular clusters around NGC 1399, the central galaxy in the Fornax cluster, have been obtained with FORS2 and the Mask Exchange Unit (MXU) at the ESO Very Large Telescope. This is the largest sample of globular cluster velocities around any galaxy obtained so far. The mean velocity uncertainty is 50 km/sec. This data sample is accurate and large enough to be used in studies of the mass distribution of NGC 1399 and the properties of its globular cluster system. Here we...
Source: http://arxiv.org/abs/astro-ph/0401218v1
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
68
68
Sep 22, 2013
09/13
by
J. D. Silverman; P. J. Green; D. W. Kim; B. J. Wilkes; R. A. Cameron; D. Morris; A. Dosaj; C. Smith; L. Infante; P. S. Smith; B. T. Jannuzi; S. Mathur
texts
eye 68
favorite 0
comment 0
We present X-ray and optical observations of CXOMP J213945.0-234655, a high redshift (z=4.93) quasar discovered through the Chandra Multiwavelength Project (ChaMP). This object is the most distant X-ray selected quasar published, with an X-ray luminosity of L(X)=5.9x10^44 erg/s (measured in the 0.3-2.5 keV band and corrected for Galactic absorption). CXOMP J213945.0-234655 is a g' dropout object (>26.2), with r'=22.87 and i'=21.36. The rest-frame X-ray to optical flux ratio is similar to...
Source: http://arxiv.org/abs/astro-ph/0201379v2
51
51
Sep 20, 2013
09/13
by
P. M. Garnavich; K. Z. Stanek; L. Wyrzykowski; L. Infante; E. Bendek; D. Bersier; S. T. Holland; S. Jha; T. Matheson; R. P. Kirshner; K. Krisciunas; M. M. Phillips; R. G. Carlberg
texts
eye 51
favorite 0
comment 0
We present the discovery and follow-up observations of the afterglow of the GRB 011121 and its associated supernova SN 2001ke. Images were obtained with the OGLE 1.3m telescope in BVRI passbands, starting 10.3 hours after the burst. The temporal analysis of our early data indicates a steep decay, independent of wavelength with power-law index alpha=-1.72+/-0.05. There is no evidence for a break in the light curve earlier than 2.5 days after the burst. The spectral energy distribution determined...
Source: http://arxiv.org/abs/astro-ph/0204234v1
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
80
80
Jul 19, 2013
07/13
by
Rich Bielby; T. Shanks; P. M. Weilbacher; L. Infante; N. H. M. Crighton; Carlos Bornancini; N. Bouché; P. Héraudeau; D. G. Lambas; J. Lowenthal; D. Minniti; N. Padilla; P. Petitjean; T. Theuns
texts
eye 80
favorite 0
comment 0
We present the initial imaging and spectroscopic data acquired as part of the VLT VIMOS Lyman-break galaxy Survey. UBR (or UBVI) imaging covers five 36'x36' fields centred on bright z>3 QSOs, allowing ~21,000 22 LBGs and 10 z>2 QSOs from a total of 19 VIMOS pointings. From the galaxy spectra, we observe a 625+-510 km/s velocity offset between the ISM absorption and Ly-alpha emission line redshifts. Using the photometric and spectroscopic catalogues, we have analysed the galaxy clustering...
Source: http://arxiv.org/abs/1005.3028v2
49
49
Sep 21, 2013
09/13
by
R. Bielby; M. D. Hill; T. Shanks; N. H. M. Crighton; L. Infante; C. G. Bornancini; H. Francke; P. Heraudeau; D. G. Lambas; N. Metcalfe; D. Minniti; N. Padilla; T. Theuns; P. Tummuangpak; P. Weilbacher
texts
eye 49
favorite 0
comment 0
We present a catalogue of 2135 galaxy redshifts from the VLT LBG Redshift Survey (VLRS), a spectroscopic survey of z ~ 3 galaxies in wide fields centred on background quasi-stellar objects. We have used deep optical imaging to select galaxies via the Lyman-break technique. Spectroscopy of the Lyman-break galaxies (LBGs) was then made using the Visible Multi-Object Spectrograph (VIMOS), giving a mean redshift of z=2.79. We analyse the clustering properties of the VLRS sample and also of the VLRS...
Source: http://arxiv.org/abs/1204.3635v2
