The Chandra Deep Field South: Optical Spectroscopy I

Details The Chandra Deep Field South: Optical Spectroscopy I The Chandra Deep Field South: Optical Spectroscopy I

2003-12-12

arxiv.org/abs/astro-ph/0312324v2

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ supplement. Full version is available from http://www.mpe.mpg.de/~mainieri/cdfs_pub/

Scientific paper

10.1086/424707

We present the results of our spectroscopic follow-up program of the X-ray sources detected in the 942 ks exposure of the Chandra Deep Field South (CDFS). 288 possible counterparts were observed at the VLT with the FORS1/FORS2 spectrographs for 251 of the 349 Chandra sources (including three additional faint X-ray sources). Spectra and R-band images are shown for all the observed sources and R-K colours are given for most of them. Spectroscopic redshifts were obtained for 168 X-ray sources, of which 137 have both reliable optical identification and redshift estimate (including 16 external identifications). The R<24 observed sample comprises 161 X-ray objects (181 optical counterparts) and 126 of them have unambiguous spectroscopic identification. We introduce a new classification based solely on X-ray properties, HR and X-ray luminosity, consistent with the unified AGN model. This X-ray classification uncovers a large fraction of optically obscured, X-ray luminous AGNs missed by the classical optical classification.

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