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Journal article
MEAN SPECTRAL ENERGY DISTRIBUTIONS AND BOLOMETRIC CORRECTIONS FOR LUMINOUS QUASARS
The Astrophysical journal. Supplement series, v 206(1)
01 May 2013
Abstract
We explore the mid-infrared (mid-IR) through ultraviolet (UV) spectral energy distributions (SEDs) of 119,652 luminous broad-lined quasars with 0.064 < z < 5.46 using mid-IR data from Spitzer and WISE, near-infrared data from the Two Micron All Sky Survey and UKIDSS, optical data from the Sloan Digital Sky Survey, and UV data from the Galaxy Evolution Explorer. The mean SED requires a bolometric correction (relative to 2500 angstrom) of BC2500 (angstrom) = 2.75 +/- 0.40 using the integrated light from 1 mu m-2 keV, and we further explore the range of bolometric corrections exhibited by individual objects. In addition, we investigate the dependence of the mean SED on various parameters, particularly the UV luminosity for quasars with 0.5 less than or similar to z less than or similar to 3 and the properties of the UV emission lines for quasars with z greater than or similar to 1.6; the latter is a possible indicator of the strength of the accretion disk wind, which is expected to be SED-dependent. Luminosity-dependent mean SEDs show that, relative to the high-luminosity SED, low-luminosity SEDs exhibit a harder (bluer) far-UV spectral slope (alpha(UV)), a redder optical continuum, and less hot dust. Mean SEDs constructed instead as a function of UV emission line properties reveal changes that are consistent with known Principal Component Analysis trends. A potentially important contribution to the bolometric correction is the unseen extreme UV (EUV) continuum. Our work suggests that lower-luminosity quasars and/or quasars with disk-dominated broad emission lines may require an extra continuum component in the EUV that is not present (or much weaker) in high-luminosity quasars with strong accretion disk winds. As such, we consider four possible models and explore the resulting bolometric corrections. Understanding these various SED-dependent effects will be important for accurate determination of quasar accretion rates.
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Details
- Title
- MEAN SPECTRAL ENERGY DISTRIBUTIONS AND BOLOMETRIC CORRECTIONS FOR LUMINOUS QUASARS
- Creators
- Coleman M. Krawczyk - Drexel UniversityGordon T. Richards - Drexel UniversitySajjan S. Mehta - Drexel UniversityMichael S. Vogeley - Drexel UniversityS. C. Gallagher - Western UniversityKaren M. Leighly - University of OklahomaNicholas P. Ross - Lawrence Berkeley National LaboratoryDonald P. Schneider - Pennsylvania State University
- Publication Details
- The Astrophysical journal. Supplement series, v 206(1)
- Publisher
- Iop Publishing Ltd
- Number of pages
- 19
- Grant note
- Alfred P. Sloan Fellowship; Alfred P. Sloan Foundation NNX08AJ27G; NNX10AF74G; NNX12AI49G / NASA; National Aeronautics & Space Administration (NASA) Alexander von Humboldt Research Fellowship; Alexander von Humboldt Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000318556300004
- Scopus ID
- 2-s2.0-84877769491
- Other Identifier
- 991019168456804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics