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Journal article
MINING FOR DUST IN TYPE 1 QUASARS
The Astronomical journal, v 149(6)
01 Jun 2015
Abstract
We explore the extinction/reddening of similar to 35,000 uniformly selected quasars with 0 < z <= 5.3 in order to better understand their intrinsic optical/ultraviolet (UV) spectral energy distributions. Using rest-frame optical-UV photometry taken from the Sloan Digital Sky Survey's (SDSS) 7th data release, cross-matched to WISE in the mid-infrared, 2MASS and UKIDSS in the near-infrared, and GALEX in the UV, we isolate outliers in the color distribution and find them well described by an SMC-like reddening law. A hierarchical Bayesian model with a Markov Chain Monte Carlo sampling method was used to find distributions of power law indices and E(B-V) consistent with both the broad absorption line (BAL) and non-BAL samples. We find that, of the ugriz color-selected type 1 quasars in SDSS, 2.5% (13%) of the non-BAL (BAL) sample are consistent with E(B-V)> 0.1 and 0.1% (1.3%) with E(B-V)> 0.2. Simulations show both populations of quasars are intrinsically bluer than the mean composite, with a mean spectral index (alpha(lambda)) of -1.79 (-1.83). The emission and absorption-line properties of both samples reveal that quasars with intrinsically red continua have narrower Balmer lines and stronger high-ionization emission lines, the latter indicating a harder continuum in the extreme-UV and the former pointing to differences in black hole mass and/or orientation.
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Details
- Title
- MINING FOR DUST IN TYPE 1 QUASARS
- Creators
- Coleman M. Krawczyk - Institute of Cosmology and Gravitation, University of PortsmouthGordon T. Richards - Drexel UniversityS. C. Gallagher - Western UniversityKaren M. Leighly - University of OklahomaPaul C. Hewett - University of CambridgeNicholas P. Ross - Drexel UniversityP. B. Hall - York University
- Publication Details
- The Astronomical journal, v 149(6)
- Publisher
- Iop Publishing Ltd
- Number of pages
- 20
- Grant note
- Max Planck Society; Foundation CELLEX U.S. Department of Energy; United States Department of Energy (DOE) National Aeronautics and Space Administration; National Aeronautics & Space Administration (NASA) Higher Education Funding Council for England; UK Research & Innovation (UKRI); Higher Education Funding Council for England (HEFCE) Japanese Monbukagakusho; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Alexander von Humboldt Research Fellowship; Alexander von Humboldt Foundation National Science Foundation; National Science Foundation (NSF) Natural Science and Engineering Research Council of Canada; Natural Sciences and Engineering Research Council of Canada (NSERC) Alexander von Humboldt Foundation at the Max-Planck-Institut fur Astronomie; Alexander von Humboldt Foundation ST/K000985/1; ST/L00481X/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) NNX08AJ27G; NNX10AF74G; NNX12AI49G / NASA; National Aeronautics & Space Administration (NASA) Alfred P. Sloan Foundation ST/L00481X/1; ST/K000985/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000355250400026
- Scopus ID
- 2-s2.0-84934873387
- Other Identifier
- 991019168887604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics