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Evolution of the Quasar Luminosity Function Over 3 < z < 5 in the COSMOS Survey Field
Daniel Masters, Peter Capak, Mara Salvato +10
We investigate the high-redshift quasar luminosity function (QLF) down to an apparent magnitude of I(AB) = 25 in the Cosmic Evolution Survey (COSMOS). Careful analysis of the exten…
Constraints on the faint end of the quasar luminosity function at z~5 in the COSMOS field
H. Ikeda, T. Nagao, K. Matsuoka +12
We present the result of our low-luminosity quasar survey in the redshift range of 4.5 < z < 5.5 in the COSMOS field. Using the COSMOS photometric catalog, we selected 15 quasar ca…
Near-infrared spectroscopy of a nitrogen-loud quasar SDSS J1707+6443
N. Araki, T. Nagao, K. Matsuoka +6
We present near-infrared spectroscopy of the z=3.2 quasar SDSS J1707+6443, obtained with MOIRCS on the Subaru Telescope. This quasar is classified as a "nitrogen-loud" quasar becau…
Dissecting Photometric redshift for Active Galactic Nuclei using XMM- and Chandra-COSMOS samples
M. Salvato, O. Ilbert, G. Hasinger +61
With this paper, we release accurate photometric redshifts for 1692 counterparts to Chandra sources in the central square degree of the COSMOS field. The availability of a large tr…
The Population of High Redshift AGNs in the Chandra COSMOS survey
F. Civano, M. Brusa, A. Comastri +19
We present the high redshift (3<z<5.3) 0.5-2 keV number counts and the 2-10 keV (rest frame) space density of X-ray selected AGNs detected in the Chandra COSMOS survey. The sample…
Spectropolarimetric Evidence for Radiatively Inefficient Accretion in an Optically Dull Active Galaxy
Jonathan R. Trump, Tohru Nagao, Hiro Ikeda +9
We present Subaru/FOCAS spectropolarimetry of two active galaxies in the Cosmic Evolution Survey. These objects were selected to be optically dull, with the bright X-ray emission o…