Hubble Space Telescope imaging in the Chandra Deep Field-South.: I.: Multiple active galactic nucleus populations

被引:23
作者
Schreier, EJ
Koekemoer, AM
Grogin, NA
Giacconi, R
Gilli, R
Kewley, L
Norman, C
Hasinger, G
Rosati, P
Marconi, A
Salvati, M
Tozzi, P
机构
[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[2] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[3] Inst Astrophys, D-14482 Potsdam, Germany
[4] European So Observ, D-85748 Garching, Germany
[5] Osserv Astrofis Arcetri, I-50125 Florence, Italy
[6] Osserv Astron Trieste, I-34131 Trieste, Italy
关键词
galaxies : active; galaxies : high-redshift; galaxies : Seyfert; X-rays : galaxies;
D O I
10.1086/322354
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present preliminary results from imaging three Hubble Space Telescope (HST) Wide Field Planetary Camera 2 fields in V and I within the Chandra Deep Field-South (CDF-S). HST Is sensitivity and resolution are sufficient to reveal optical counterparts for 24 of the 26 CDF-S X-ray sources detected in the 300 ks X-ray catalog and determine the morphologies of most of these. We find that the X-ray sources comprise two apparently distinct populations of optical candidates : one optically faint (I greater than or similar to 24), with V-I colors consistent with the I>24 field population, and the other significantly brighter (I less than or similar to 22), with colors redder than the I < 22 field population. More than two-thirds of the X-ray source counterparts are resolved galaxies. The brighter sources are mostly active galactic nuclei (AGNs) based on their high X-ray luminosity. The optically resolved sources in the brighter population have a very narrow range of V-I color and appear to be a mix of both late- and early-type morphologies at low to moderate redshift. We show that the second population, with fainter optical counterparts, can be explained as higher redshift type 2 AGNs.
引用
收藏
页码:127 / 138
页数:12
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