Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514315g&link_type=abstract
American Astronomical Society Meeting 205, #143.15; Bulletin of the American Astronomical Society, Vol. 36, p.1586
Other
Scientific paper
Recent studies have begun to reveal the presence of a red population of quasars which have been long-sought in order to explain the x-ray background, as well as to illuminate models of quasar evolution and their connection to the evolution of galaxies. Using the FIRST and 2MASS surveys we have identified over 100 heavily reddened quasars (0.1 < E(B-V) < 1.5) by selecting objects with optical-near-infrared colors such that R-K>4 and J-K>1.7; 50 percent of such objects with 20cm flux densities greater than 1 mJy are red quasars. Their colors may arise from dust extinction and/or a red synchrotron component associated with a flat radio spectrum. We have obtained contemporaneous 20cm and 3cm measurements of about 50 of these quasars to determine the extent to which red synchrotron emission contributes; in most cases, dust obscuration is required. We also present an optical to near-infrared quasar composite spectrum spanning 0.1-4 microns constructed from observations of low redshift (z<0.38), normal, blue SDSS-selected quasars. This spectrum is useful, among other things, for exploring quantitatively the extinction in our red quasars.
Becker Robert H.
Glikman Eilat
Gregg Michael D.
Helfand David J.
Lacy Mark
No associations
LandOfFree
Shedding Light on the Dust in Obscured Quasars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Shedding Light on the Dust in Obscured Quasars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shedding Light on the Dust in Obscured Quasars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1643942