Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
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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.
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The record
- Venue
- The Astrophysical Journal Supplement Series
- Topic
- Galaxies: Formation, Evolution, Phenomena
- Field
- Physics and Astronomy
- Canadian institutions
- York University
- Funders
- Los Alamos National LaboratoryU.S. Naval ObservatoryFermilabMax-Planck-Institut für AstronomieMax-Planck-GesellschaftChinese Academy of SciencesUniversity of CambridgeNew Mexico State UniversityUniversity of PortsmouthUniversität BaselUniversity of PittsburghJohns Hopkins UniversityOhio State UniversityCalifornia Institute of TechnologyU.S. Department of EnergyJet Propulsion LaboratoryPrinceton UniversityNational Science FoundationUniversity of WashingtonDrexel UniversityAlfred P. Sloan FoundationNational Aeronautics and Space AdministrationCase Western Reserve University
- Keywords
- QuasarAstrophysicsPhysicsROSATRedshiftPhotometry (optics)Active galactic nucleusSpectral energy distributionSkyAstronomyLuminositySpitzer Space TelescopeTelescopeGalaxyStars
- Has abstract in OpenAlex
- yes