========================================================================== J/ApJ/693/1713 Spectroscopy of X-ray sources in ECDF-S (Treister+, 2009) The following files can be converted to FITS (extension .fit or fit.gz) table2.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/ApJ/693/1713 ==========================================================================
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Beginning of ReadMe : J/ApJ/693/1713 Spectroscopy of X-ray sources in ECDF-S (Treister+, 2009) ================================================================================ Optical spectroscopy of X-ray sources in the extended Chandra Deep Field South. Treister E., Virani S., Gawiser E., Urry C.M., Lira P., Francke H., Blanc G.A., Cardamone C.N., Damen M., Taylor E.N., Schawinski K. <Astrophys. J., 693, 1713-1727 (2009)> =2009ApJ...693.1713T ================================================================================ ADC_Keywords: Active gal. nuclei ; Redshifts ; Spectroscopy ; X-ray sources ; Galaxies, optical ; Surveys Keywords: galaxies: active - quasars: general - X-rays: galaxies Abstract: We present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and a literature search. We find that the active galactic nucleus (AGN) host galaxies have on average redder rest-frame optical colors than nonactive galaxies, and that they live mostly in the "green valley". The dependence of the fraction of AGNs that are obscured on both luminosity and redshift is confirmed at high significance and the observed AGN spatial density is compared with the expectations from existing luminosity functions. These AGNs show a significant difference in the mid-IR to X-ray flux ratio for obscured and unobscured AGNs, which can be explained by the effects of dust self-absorption on the former. This difference is larger for lower luminosity sources, which is consistent with the dust opening angle depending on AGN luminosity. Description: Sources targeted for spectroscopy were selected from the catalog of Chandra sources of Virani et al. (2006, Cat. J/AJ/131/2373). We used the IMACS wide-field spectrograph mounted on the Magellan I Baade telescope at Las Campanas Observatory in 2003 Oct 26-27, 2005 Feb 4-7, 2005 Nov 2-3, 2006 Oct 25-27, 2006 Nov 21-22 and 2007 Feb 18-20. The VIMOS spectrograph mounted at the Nasmyth focus B of UT3 was also used to obtain optical spectroscopy for the X-ray sources in the ECDF-S. In order to take advantage of existing spectroscopic observations of the X-ray sources in ECDF-S, we did an extensive literature search. In particular, we used the Master Compilation of GOODS/CDF-S spectroscopy.