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SubmittedOpen Access (License Unspecified), Open
Journal article
The Sloan Digital Sky Survey Reverberation Mapping Project: The CIV Blueshift, Its Variability, and Its Dependence Upon Quasar Properties
The Astrophysical journal, v 854(2)
20 Feb 2018
Abstract
We use the multi-epoch spectra of 362 quasars from the Sloan Digital Sky Survey Reverberation Mapping project to investigate the dependence of the blueshift of C IV. relative to Mg II. on quasar properties. We confirm that high-blueshift sources tend to have low C IV. equivalent widths (EWs), and that the low-EW sources span a range of blueshift. Other high-ionization lines, such as He II, also show similar blueshift properties. The ratio of the line width (measured as both the full width at half maximum and the velocity dispersion) of C IV to that of Mg II increases with blueshift. Quasar variability enhances the connection between the C IV. blueshift and quasar properties (e.g., EW). The variability of the Mg II line center (i.e., the wavelength that bisects the cumulative line flux) increases with blueshift. In contrast, the C IV line center shows weaker variability at the extreme blueshifts. Quasars with the high-blueshift C IV lines tend to have less variable continuum emission, when controlling for EW, luminosity, and redshift. Our results support the scenario that high-blueshift sources tend to have large Eddington ratios.
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Details
- Title
- The Sloan Digital Sky Survey Reverberation Mapping Project: The CIV Blueshift, Its Variability, and Its Dependence Upon Quasar Properties
- Creators
- Mouyuan Sun - Univ. of Sci. and Tech. of ChinaYongquan Xue - Univ. of Sci. and Tech. of ChinaGordon T. Richards - Drexel UniversityJonathan R. Trump - University of ConnecticutYue Shen - National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USAW. N. Brandt - Pennsylvania State UniversityD. P. Schneider - Pennsylvania State University
- Publication Details
- The Astrophysical journal, v 854(2)
- Publisher
- Iop Publishing Ltd
- Number of pages
- 15
- Grant note
- 2016M600485 / China Postdoctoral Science Foundation QYZDJ-SSW-SLH006 / CAS Frontier Science Key Research Program GO6-17083X / Chandra X-ray Center grant National Science Foundation; National Science Foundation (NSF) Fundamental Research Funds for the Central Universities U.S. Department of Energy Office of Science; United States Department of Energy (DOE) AST-1516784 / NSF; National Science Foundation (NSF) Alfred P. Sloan Foundation 2015CB857004 / 973 Program; National Basic Research Program of China
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000425637200010
- Scopus ID
- 2-s2.0-85042716262
- Other Identifier
- 991019168432004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics