Measuring the Fraction of Obscured Quasars by the Infrared Luminosity of Unobscured Quasars

摘要: Recent work has suggested that the fraction of obscured AGNs declines with increasing luminosity, but it been difficult to quantify this trend. Here we attempt measure as a function luminosity by studying ratio mid-infrared intrinsic nuclear bolometric in unobscured AGNs. Because is created dust reprocessing shorter wavelength light, diagnostic -->fobsc, solid angle around nucleus covered obscuring matter. In order eliminate possible redshift dependences while also achieving large dynamic range have collected archival 24 μm MIPS photometry from objects -->z ~ 1 Sloan Digital Sky Survey, Great Observatories Origins Deep and Cosmic Evolution Survey. To for each object, used optical data supplemented GALEX data. We find mean decreases factor ~3 -->Lbol = 1044–3 × 1047 ergs s -->−1 range, there scatter at constant -->Lbol. Using radiation transfer solutions model geometries, show how IR/bolometric relates -->fobsc compare these values those obtained samples X-ray-selected Although approximate agreement, our method indicates somewhat higher particularly middle luminosities, suggesting may be significant number heavily missed X-ray surveys.