Unification of Luminous Type 1 Quasars through CIV Emission
Gordon T. Richards,Nicholas E. Kruczek,Sarah Gallagher,Patrick B. Hall,Paul C. Hewett,Karen M. Leighly,Rajesh P. Deo,Rachael M. Kratzer,Yue Shen +8 more
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In this paper, the authors investigated the anti-correlation between L_UV and emission line EQW (the Baldwin Effect) and the "blueshifting" of high-ionization emission lines.Abstract:
Using a sample of 30,000 quasars from SDSS-DR7, we explore the range of properties exhibited by high-ionization, broad emission lines, such as CIV 1549. Specifically we investigate the anti-correlation between L_UV and emission line EQW (the Baldwin Effect) and the "blueshifting" of high-ionization emission lines. The blueshift of the CIV emission line is nearly ubiquitous, with a mean shift of 810 km/s for radio-quiet (RQ) quasars and 360 km/s for radio-loud (RL) quasars, and the Baldwin Effect is present in both RQ and RL samples. Composite spectra are constructed as a function of CIV emission line properties in attempt to reveal empirical relationships between different line species and the SED. Within a two-component disk+wind model of the broad emission line region (BELR), where the wind filters the continuum seen by the disk component, we find that RL quasars are consistent with being dominated by the disk component, while BALQSOs are consistent with being dominated by the wind component. Some RQ objects have emission line features similar to RL quasars; they may simply have insufficient black hole (BH) spin to form radio jets. Our results suggest that there could be significant systematic errors in the determination of L_bol and BH mass that make it difficult to place these findings in a more physical context. However, it is possible to classify quasars in a paradigm where the diversity of BELR parameters are due to differences in an accretion disk wind between quasars (and over time); these differences are underlain primarily by the SED, which ultimately must be tied to BH mass and accretion rate.read more
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References
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Journal ArticleDOI
Unified Schemes for Radio-Loud Active Galactic Nuclei
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TL;DR: In this article, the authors describe radio-loud active galactic nuclei (AGN) and summarize the evidence for anisotropic emission, and outline the two most plausible unified schemes.
Journal ArticleDOI
The 2.5 m Telescope of the Sloan Digital Sky Survey
TL;DR: The Sloan Digital Sky Survey Telescope (SDST) as mentioned in this paper is a modified two-corrector Ritchey-Chretien design which has a 2.5m, f/2.25m, a 1.08m, and one of a pair of interchangeable highly aspheric correctors near the focal focal plane, one for imaging and the other for spectroscopy.
Journal ArticleDOI
A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
Philip F. Hopkins,Lars Hernquist,Thomas J. Cox,Tiziana Di Matteo,Brant Robertson,Volker Springel +5 more
TL;DR: In this article, the authors present an evolutionary model for starbursts, quasars, and spheroidal galaxies, in which mergers between gas-rich galaxies drive nuclear inflows of gas, producing intense starburst and feeding the buried growth of supermassive black holes (BHs) until feedback expels gas and renders a briefly visible optical quasar.
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Composite Quasar Spectra From the Sloan Digital Sky Survey
TL;DR: In this article, the authors created a variety of composite quasar spectra using a homogeneous data set of over 2200 spectra from the Sloan Digital Sky Survey (SDSS).
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The Soft X-Ray Properties of a Complete Sample of Optically Selected Quasars II. Final Results
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