The COSMOS AGN Spectroscopic Survey I: XMM Counterparts
Jonathan R. Trump, Chris D. Impey, Martin Elvis, Patrick J. McCarthy,, John P. Huchra, Marcella Brusa, Mara Salvato, Peter Capak, Nico Cappelluti,, Francesca Civano, Andrea Comastri, Jared Gabor, Heng Hao, Gunther Hasinger,, Knud Jahnke, Brandon C. Kelly, Simon J. Lilly

TL;DR
This paper presents a comprehensive spectroscopic survey of X-ray selected AGN in the COSMOS field, providing detailed classifications, redshift distributions, and insights into the obscured and unobscured AGN populations up to z<1.
Contribution
It offers the first large, flux-limited optical spectroscopic sample of X-ray AGN in COSMOS, with detailed classification and population analysis.
Findings
90% redshift completeness for X-ray flux-limited sample
Obscured to unobscured AGN ratio increases with redshift at z<1
Nearly all X-ray AGN with L_{0.5-10 keV}>3x10^42 erg/s are included up to z<1
Abstract
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…
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