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HST Imaging in the Chandra Deep Field South: I. Multiple AGN Populations | E. J. Schreier
; A. M. Koekemoer
; N. A. Grogin
; R. Giacconi
; R. Gilli
; L. Kewley
; C. Norman
; G. Hasinger
; P. Rosati
; A. Marconi
; M. Salvati
; P. Tozzi
; | Date: |
16 May 2001 | Subject: | astro-ph | Affiliation: | STScI), A. M. Koekemoer (STScI), N. A. Grogin (STScI), R. Giacconi (AUI/JHU), R. Gilli (JHU), L. Kewley (JHU), C. Norman (JHU), G. Hasinger (AIP), P. Rosati (ESO), A. Marconi (Arcetri), M. Salvati (Arcetri), P. Tozzi (Trieste | Abstract: | We present preliminary results from imaging three HST/WFPC2 fields in V and I within the Chandra Deep Field South (CDFS). HST’s sensitivity and resolution are sufficient to reveal optical counterparts for 24 of the 26 CDFS X-ray sources detected in the 300 ksec X-ray catalog and to 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 > 24) with V - I colors consistent with the I > 24 field population; the other significantly brighter (I < 22) with colors redder than the I < 22 field population. More than 2/3 of the X-ray source counterparts are resolved galaxies. The brighter sources are mostly AGN, 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 AGN. | Source: | arXiv, astro-ph/0105271 | Services: | Forum | Review | PDF | Favorites |
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