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X-ray Surveys of the Obscured Universe

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ISO Surveys of a Dusty Universe

Part of the book series: Lecture Notes in Physics ((LNP,volume 548))

Abstract

Deep X-ray surveys have shown that the cosmic X-ray background (XRB) is largely due to accretion onto supermassive black holes, integrated over cosmic time. However, the characteristic hard spectrum of the XRB can only be explained if most AGNsp ectra are heavily absorbed. The absorbed AGNwill suffer severe extinction and therefore, unlike classical QSOs, will not be prominent at optical wavelengths. Most of the accretion power is being absorbed by gas and dust and will have to be reradiated in the FIR/sub-mm band. AGNcould therefore contribute a substantial fraction to the recently discovered cosmic FIR/sub-mm background. Here it is shown that a number of high-redshift absorbed X-ray sources selected in the ROSAT Deep Survey of the Lockman Hole have broad-band spectral energy distributions very similar to the local ULIRG NGC6240, lending additional support to the background models for the obscured universe.

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Author information

Authors and Affiliations

  1. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482, Potsdam

    Günther Hasinger

  2. Universität Potsdam, Am Neuen Palais 10, 14469, Potsdam

    Günther Hasinger

Authors
  1. Günther Hasinger
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Editor information

Editors and Affiliations

  1. Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany

    D. Lemke , M. Stickel  & K. Wilke ,  & 

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© 2000 Springer-Verlag Berlin Heidelberg

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Hasinger, G. (2000). X-ray Surveys of the Obscured Universe. In: Lemke, D., Stickel, M., Wilke, K. (eds) ISO Surveys of a Dusty Universe. Lecture Notes in Physics, vol 548. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45553-1_53

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  • DOI: https://doi.org/10.1007/3-540-45553-1_53

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-67479-5

  • Online ISBN: 978-3-540-45553-0

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