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FIRST-2MASS Sources Below the APM Detection Threshold: A Population of Highly Reddened Quasars | | Eilat Glikman
; Michael D. Gregg
; Mark Lacy
; David J. Helfand
; Robert H. Becker
; Richard L. White
; | | Date: |
16 Feb 2004 | | Journal: | Astrophys.J. 607 (2004) 60-75 | | Subject: | astro-ph | | Affiliation: | 2,3), Mark Lacy , David J. Helfand , Robert H. Becker (2,3), Richard L. White ( Columbia Univeristy, U.C. Davis, IGPP, LLNL, Spitzer Science Center, STScI | | Abstract: | We have constructed a sample of bright near-infrared sources which are detected at radio wavelengths but undetected on the POSS I plates in order to search for a population of dust-obscured quasars. Optical and infrared spectroscopic followup of the sample has led to the discovery of seventeen heavily reddened quasars (B-K>6.5), fourteen of which are reported here for the first time. This has allowed us to define a region in the R-K, J-K color plane in which 50% of the radio-selected objects are highly reddened quasars. We compare the surface density of this previously overlooked population to that of UVX- radio-selected quasars, finding that they make up ~20% of the total quasar population for K < 15.5. | | Source: | arXiv, astro-ph/0402386 | | Services: | Forum | Review | PDF | Favorites | |
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