Chandra Observations of 12 Luminous Red Quasars

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The authors present results of a study of 12 dust-reddened quasars with 0.4 < z < 2.65 and reddenings in the range 0.15 < E(B-V) < 1.7. They obtained ACIS-S X-ray spectra of these quasars, estimated the column densities towards them, and hence obtained the gas:dust ratios in the material obscuring the quasar. They detect all but one of the red quasars in the X-rays. Even though there is no obvious correlation between the X-ray determined column densities of the sources and their optical color or reddening, all of the sources show absorbed X-ray spectra. When they correct the luminosity ... continued below

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Urrutia, T; Lacy, M; Gregg, M D & Becker, R H March 11, 2005.

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The authors present results of a study of 12 dust-reddened quasars with 0.4 < z < 2.65 and reddenings in the range 0.15 < E(B-V) < 1.7. They obtained ACIS-S X-ray spectra of these quasars, estimated the column densities towards them, and hence obtained the gas:dust ratios in the material obscuring the quasar. They detect all but one of the red quasars in the X-rays. Even though there is no obvious correlation between the X-ray determined column densities of the sources and their optical color or reddening, all of the sources show absorbed X-ray spectra. When they correct the luminosity for absorption, they can be placed among luminous quasars; therefore their objects belong to the group of high luminosity analogues of the sources contributing to the X-ray background seen in deep X-ray observations. Such sources are also found in serendipitous shallow X-ray surveys. There is a hint that the mean spectral slope of the red quasar is higher than that of normal, unobscured quasars, which could be an indication for higher accretion rates and/or an evolutionary effect. They investigate the number density of these sources compared to type 2 AGN based on the X-ray background and estimate how many moderate luminosity red quasars may be found in deep X-ray fields.

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PDF-file: 23 pages; size: 0.3 Mbytes

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  • Journal Name: Astrophysical Journal; Journal Volume: 627; Journal Issue: 1

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  • Report No.: UCRL-JRNL-210536
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 862383
  • Archival Resource Key: ark:/67531/metadc793739

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 11, 2005

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Nov. 22, 2016, 10:10 p.m.

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Urrutia, T; Lacy, M; Gregg, M D & Becker, R H. Chandra Observations of 12 Luminous Red Quasars, article, March 11, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc793739/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.