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

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

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.7410k&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #74.10; Bulletin of the American Astronomical Society, Vol. 33, p.899

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Scientific paper

We present recent results from HST/WFPC2 imaging in the V and I bands of three fields within the 1 Msec Chandra Deep Field South (CDFS). HST's unparallelled resolution and sensitivity are sufficient to reveal optical counterparts for 38 of the 42 X-ray sources detected in the 1 Msec CDFS X-ray catalog, and the images reveal the morphologies of most of these objects. We find that the X-ray sources comprise two apparently distinct populations in the optical regime: one optically faint (I ~ 24 - 26) withV-I colors consistent with the I > 24 field population; the other significantly brighter (I < 23) with colors redder than the I < 23 field population. More than 2/3 of the X-ray source counterparts are clearly resolved by HST, while the rest are likely dominated by emission from Type 1 AGN. The optically resolved sources in the brighter population have a very narrow range of V-I color and comprise a mix of both late and early type morphologies at moderate redshifts (z ~ 0.3 - 1). We show that the second population, with fainter optical counterparts, can be explained as being predominantly higher redshift (z ~ 2 - 3) Type 2 AGN.

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