The COSMOS AGN Spectroscopic Survey I: XMM Counterparts - AstrophysicsReport as inadecuate




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Abstract: We present optical spectroscopy for an X-ray and optical flux-limited sampleof 677 XMM-Newton selected targets covering the 2 deg^2 COSMOS field, with ayield of 485 high-confidence redshifts. The majority of the spectra wereobtained over three seasons 2005-2007 with the IMACS instrument on theMagellan Baade telescope. We also include in the sample previously publishedSloan Digital Sky Survey spectra and supplemental observations withMMT-Hectospec. We detail the observations and classification analyses. Thesurvey is 90% complete to flux limits of f {0.5-10 keV}>8 x 10^-16 erg cm^-2s^-1 and i AB+<22, where over 90% of targets have high-confidence redshifts.Making simple corrections for incompleteness due to redshift and spectral typeallows for a description of the complete population to $i AB+<23. The correctedsample includes 57% broad emission line Type 1, unobscured AGN at0.133 x 10^42 erg s^-1 to z<1, of both optically obscured andunobscured types. We find statistically significant evidence that the obscuredto unobscured AGN ratio at z<1 increases with redshift and decreases withluminosity.



Author: Jonathan R. Trump, Chris D. Impey, Martin Elvis, Patrick J. McCarthy, John P. Huchra, Marcella Brusa, Mara Salvato, Peter Capak,

Source: https://arxiv.org/







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