NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-17 T01:19:58 PST
Help | Comment | NED Home

For refcode 2006ApJS..166..470R:
Retrieve 259 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2006ApJS..166..470R Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars Gordon T. Richards, Mark Lacy, Lisa J. Storrie-Lombardi, Patrick B. Hall, S. C. Gallagher, Dean C. Hines, Xiaohui Fan, Casey Papovich, Daniel E. Vanden Berk, George B. Trammell, Donald P. Schneider, Marianne Vestergaard, Donald G. York, Sebastian Jester, Scott F. Anderson, Tamas Budavari, and Alexander S. Szalay Abstract. We present an analysis of the mid-infrared (MIR) and optical properties of type 1 (broad-line) quasars detected by the Spitzer Space Telescope. The MIR color-redshift relation is characterized to z~3, with predictions to z=7. We demonstrate how combining MIR and optical colors can yield even more efficient selection of active galactic nuclei (AGNs) than MIR or optical colors alone. Composite spectral energy distributions (SEDs) are constructed for 259 quasars with both Sloan Digital Sky Survey and Spitzer photometry, supplemented by near-IR, GALEX, VLA, and ROSAT data, where available. We discuss how the spectral diversity of quasars influences the determination of bolometric luminosities and accretion rates; assuming the mean SED can lead to errors as large as 50% for individual quasars when inferring a bolometric luminosity from an optical luminosity. Finally, we show that careful consideration of the shape of the mean quasar SED and its redshift dependence leads to a lower estimate of the fraction of reddened/obscured AGNs missed by optical surveys as compared to estimates derived from a single mean MIR to optical flux ratio. Key words: Catalogs, Galaxies: Active, Infrared: Galaxies, Galaxies: Quasars: General, Radio Continuum: Galaxies, Surveys, Ultraviolet: Galaxies, X-Rays: Galaxies
Retrieve 259 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home