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Journal article
C IV EMISSION AND THE ULTRAVIOLET THROUGH X-RAY SPECTRAL ENERGY DISTRIBUTION OF RADIO-QUIET QUASARS
The Astronomical journal, v 142(4)
01 Oct 2011
Abstract
In the rest-frame ultraviolet (UV), two of the parameters that best characterize the range of emission-line properties in quasar broad emission-line regions are the equivalent width and the blueshift of the C IV lambda 1549 line relative to the quasar rest frame. We explore the connection between these emission-line properties and the UV through X-ray spectral energy distribution (SED) for radio-quiet (RQ) quasars. Our sample consists of a heterogeneous compilation of 406 quasars from the Sloan Digital Sky Survey (at z > 1.54) and Palomar-Green survey (at z < 0.4) that have well-measured C IV emission-line and X-ray properties (including 164 objects with measured G). We find that RQ quasars with both strong C IV emission and small C IV blueshifts can be classified as "hard-spectrum" sources that are (relatively) strong in the X-ray as compared to the UV. On the other hand, RQ quasars with both weak C IV emission and large C IV blueshifts are instead "soft-spectrum" sources that are (relatively) weak in the X-ray as compared to the UV. This work helps to further bridge optical/softX-ray "eigenvector 1" relationships to the UV and hard X-ray. Based on these findings, we argue that future work should consider systematic errors in bolometric corrections (and thus accretion rates) that are derived from a single mean SED. Detailed analysis of the C IV emission line may allow for SED-dependent corrections to these quantities.
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Details
- Title
- C IV EMISSION AND THE ULTRAVIOLET THROUGH X-RAY SPECTRAL ENERGY DISTRIBUTION OF RADIO-QUIET QUASARS
- Creators
- Nicholas E. Kruczek - Drexel UniversityGordon T. Richards - Drexel UniversityS. C. Gallagher - Western UniversityRajesh P. Deo - Drexel UniversityPatrick B. Hall - York UniversityPaul C. Hewett - University of CambridgeKaren M. Leighly - University of OklahomaColeman M. Krawczyk - Drexel UniversityDaniel Proga - University of Nevada, Las Vegas
- Publication Details
- The Astronomical journal, v 142(4)
- Publisher
- Iop Publishing Ltd
- Number of pages
- 12
- Grant note
- Max Planck Society; Foundation CELLEX AST-0707703 / NSF; National Science Foundation (NSF) University of Chicago Max-Planck-Institute for Astrophysics (MPA) U.S. Department of Energy; United States Department of Energy (DOE) Korean Scientist Group Chinese Academy of Sciences (LAMOST); Chinese Academy of Sciences United States Naval Observatory National Science and Engineering Research Council of Canada; Natural Sciences and Engineering Research Council of Canada (NSERC) Japanese Monbukagakusho; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Ohio State University University of Pittsburgh Los Alamos National Laboratory; United States Department of Energy (DOE) University of Basel ST/H004912/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) Joint Institute for Nuclear Astrophysics Alfred P. Sloan Foundation University of Washington Princeton University ST/H00243X/1; ST/H004912/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) New Mexico State University Japan Participation Group; Sloan Digital Sky Survey (SDSS) University of Portsmouth Ontario Early Research Award Higher Education Funding Council for England; UK Research & Innovation (UKRI); Higher Education Funding Council for England (HEFCE) Astrophysical Institute Potsdam Kavli Institute for Particle Astrophysics and Cosmology American Museum of Natural History Case Western Reserve University G08-9103X; NAS8-03060; 07-ADP07-0035 / National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA) Max-PlanckInstitute for Astronomy (MPIA) National Science Foundation; National Science Foundation (NSF) Cambridge University; University of Cambridge Johns Hopkins University Alfred P. Sloan Research Fellowship; Alfred P. Sloan Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000295042500034
- Scopus ID
- 2-s2.0-80054036774
- Other Identifier
- 991019167918504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics