37
37
Sep 23, 2013
09/13
by
A. Comastri; P. Ranalli; K. Iwasawa; C. Vignali; R. Gilli; I. Georgantopoulos; X. Barcons; W. N. Brandt; H. Brunner; M. Brusa; N. Cappelluti; F. J. Carrera; F. Civano; F. Fiore; G. Hasinger; V. Mainieri; A. Merloni; F. Nicastro; M. Paolillo; S. Puccetti; P. Rosati; J. D. Silverman; P. Tozzi; G. Zamorani; I. Balestra; F. E. Bauer; B. Luo; Y. Q. Xue
texts
eye 37
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We present the first results of the spectroscopy of distant, obscured AGN as obtained with the ultra-deep (~3.3 Ms) XMM-Newton survey in the Chandra Deep Field South (CDFS). One of the primary goals of the project is to characterize the X-ray spectral properties of obscured and heavily obscured Compton-thick AGN over the range of redhifts and luminosities that are relevant in terms of their contribution to the X-ray background. The ultra-deep exposure, coupled with the XMM detector's spectral...
Source: http://arxiv.org/abs/1012.4011v2
63
63
Sep 23, 2013
09/13
by
C. Saez; G. Chartas; W. N. Brandt; B. D. Lehmer; F. E. Bauer; X. Dai; G. P. Garmire
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eye 63
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We present results from a statistical analysis of 173 bright radio-quiet AGNs selected from the Chandra Deep Field-North and Chandra Deep Field-South surveys (hereafter, CDFs) in the redshift range of 0.1 < z < 4. We find that the X-ray power-law photon index (Gamma) of radio-quiet AGNs is correlated with their 2-10 keV rest-frame X-ray luminosity (L_X) at the > 99.5 percent confidence level in two redshift bins, 0.3 < z < 0.96, and 1.5 < z < 3.3 and is slightly less...
Source: http://arxiv.org/abs/0801.3599v1
49
49
Sep 19, 2013
09/13
by
F. J. Carrera; J. Ebrero; S. Mateos; M. T. Ceballos; A. Corral; X. Barcons; M. J. Page; S. R. Rosen; M. G. Watson; J. Tedds; R. Della Ceca; T. Maccacaro; H. Brunner; M. Freyberg; G. Lamer; F. E. Bauer; Y. Ueda
texts
eye 49
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AXIS (An XMM-Newton International Survey) is a survey of 36 high Galactic latitude XMM-Newton observations covering 4.8 deg2 and containing 1433 serendipitous X-ray sources detected with 5-sigma significance. We have studied the X-ray source counts in four energy bands soft (0.5-2 keV), hard (2-10 keV), XID (0.5-4.5 keV) and ultra-hard (4.5-7.5 keV). We have combined this survey with shallower and deeper surveys. Our source counts results are compatible with most previous samples in the soft,...
Source: http://arxiv.org/abs/astro-ph/0703451v1
4
4.0
Jun 30, 2018
06/18
by
G. Yang; Y. Q. Xue; B. Luo; W. N. Brandt; D. M. Alexander; F. E. Bauer; W. Cui; X. Kong; B. D. Lehmer; J. -X. Wang; X. -B. Wu; F. Yuan; Y. -F. Yuan; H. Y. Zhou
texts
eye 4
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We derive photometric redshifts (\zp) for sources in the entire ($\sim0.4$ deg$^2$) Hawaii-Hubble Deep Field-North (\hdfn) field with the EAzY code, based on point spread function-matched photometry of 15 broad bands from the ultraviolet (\bandu~band) to mid-infrared (IRAC 4.5 $\mu$m). Our catalog consists of a total of 131,678 sources. We evaluate the \zp~quality by comparing \zp~with spectroscopic redshifts (\zs) when available, and find a value of normalized median absolute deviation...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1410.6860
6
6.0
Jun 29, 2018
06/18
by
N. Laporte; L. Infante; P. Troncoso Iribarren; W. Zheng; A. Molino; F. E. Bauer; D. Bina; Tom Broadhurst; I. Chilingarian; S. Garcia; S. Kim; R. Marques-Chaves; J. Moustakas; R. Pelló; I. Pérez-Fournon; X. Shu; A. Streblyanska; A. Zitrin
texts
eye 6
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In this paper we present the results of our search for and study of $z \gtrsim 6$ galaxy candidates behind the third Frontier Fields (FF) cluster, MACSJ0717.5+3745, and its parallel field, combining data from Hubble and Spitzer. We select 39 candidates using the Lyman Break technique, for which the clear non-detection in optical make the extreme mid-$z$ interlopers hypothesis unlikely. We also take benefit from $z \gtrsim 6$ samples selected using previous Frontier Fields datasets of Abell 2744...
Topics: Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1602.02775
38
38
Sep 18, 2013
09/13
by
W. N. Brandt; C. Vignali; D. P. Schneider; D. M. Alexander; S. F. Anderson; F. E. Bauer; X. Fan; G. P. Garmire; S. Kaspi; G. T. Richards
texts
eye 38
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X-ray studies of high-redshift (z > 4) active galaxies have advanced substantially over the past few years, largely due to results from the new generation of X-ray observatories. As of this writing X-ray emission has been detected from nearly 60 high-redshift active galaxies. This paper reviews the observational results and their implications for models of the first massive black holes, and it discusses future prospects for the field.
Source: http://arxiv.org/abs/astro-ph/0212082v2
7
7.0
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 7
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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
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
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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
