HST Imaging in the Chandra Deep Field South: I. Multiple AGN Populations

Details HST Imaging in the Chandra Deep Field South: I. Multiple AGN Populations HST Imaging in the Chandra Deep Field South: I. Multiple AGN Populations

2001-05-16

arxiv.org/abs/astro-ph/0105271v1

Astronomy and Astrophysics

Astrophysics

AASTEX-Latex, 26 pages, 8 postscript figures, 6 jpeg figures. Accepted by the Astrophysical Journal

Scientific paper

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.

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