The COSMOS AGN Spectroscopic Survey I: XMM Counterparts

Details The COSMOS AGN Spectroscopic Survey I: XMM Counterparts The COSMOS AGN Spectroscopic Survey I: XMM Counterparts

2008-11-24

arxiv.org/abs/0811.3977v1

Astrophys.J.696:1195-1212,2009

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the ApJ. 31 pages, 17 figures. Table 2 is available on request

Scientific paper

10.1088/0004-637X/696/2/1195

We present optical spectroscopy for an X-ray and optical flux-limited sample of 677 XMM-Newton selected targets covering the 2 deg^2 COSMOS field, with a yield of 485 high-confidence redshifts. The majority of the spectra were obtained over three seasons (2005-2007) with the IMACS instrument on the Magellan (Baade) telescope. We also include in the sample previously published Sloan Digital Sky Survey spectra and supplemental observations with MMT/Hectospec. We detail the observations and classification analyses. The survey is 90% complete to flux limits of f_{0.5-10 keV}>8 x 10^-16 erg cm^-2 s^-1 and i_AB+<22, where over 90% of targets have high-confidence redshifts. Making simple corrections for incompleteness due to redshift and spectral type allows for a description of the complete population to $i_AB+<23. The corrected sample includes 57% broad emission line (Type 1, unobscured) AGN at 0.133 x 10^42 erg s^-1) to z<1, of both optically obscured and unobscured types. We find statistically significant evidence that the obscured to unobscured AGN ratio at z<1 increases with redshift and decreases with luminosity.

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