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SubmittedOpen Access (License Unspecified), Open
Journal article
Dust Reddening in SDSS Quasars
arXiv.org
11 Jun 2004
Abstract
Astron.J. 128 (2004) 1112-1123 We explore the form of extragalactic reddening toward quasars using a sample
of 9566 quasars with redshifts 0<z<2.2, and accurate optical colors from the
Sloan Digital Sky Survey (SDSS). We confirm that dust reddening is the primary
explanation for the red ``tail'' of the color distribution of SDSS quasars. Our
fitting to 5-band photometry normalized by the modal quasar color as a function
of redshift shows that this ``tail'' is well described by SMC-like reddening
but not by LMC-like, Galactic, or Gaskell et al. (2004) reddening. Extension to
longer wavelengths using a subset of 1886 SDSS-2MASS matches confirms these
results at high significance. We carry out Monte-Carlo simulations that match
the observed distribution of quasar spectral energy distributions using a
Lorentzian dust reddening distribution; 2% of quasars selected by the main SDSS
targeting algorithm (i.e., which are not extincted out of the sample) have
E_{B-V} > 0.1; less than 1% have E_{B-V} > 0.2, where the extinction is
relative to quasars with modal colors. Reddening is uncorrelated with the
presence of intervening narrow-line absorption systems, but reddened quasars
are much more likely to show narrow absorption at the redshift of the quasar
than are unreddened quasars. Thus the reddening towards quasars is dominated by
SMC-like dust at the quasar redshift.
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Details
- Title
- Dust Reddening in SDSS Quasars
- Creators
- Philip F Hopkins - Princeton UniversityMichael A Strauss - Princeton UniversityPatrick B Hall - Princeton UniversityGordon T Richards - Princeton UniversityAriana S Cooper - Princeton UniversityDonald P Schneider - Pennsylvania State UniversityDaniel E. Vanden Berk - University of PittsburghSebastian Jester - FermilabJ Brinkmann - New Mexico State UniversityGyula P Szokoly - High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society
- Publication Details
- arXiv.org
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000223633800010
- Scopus ID
- 2-s2.0-7944223326
- Other Identifier
- 991019201380604721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics