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The Korean Astronomical Society (한국천문학회)
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INFRARED AND HARD X-RAY DIAGNOSTICS OF AGN IDENTIFICATION FROM THE AKARI AND SWIFT/BAT ALL-SKY SURVEYS

  • Matsuta, K. (Department of Space and Astronautical Science, The Graduate University for Advanced Studies) ;
  • Gandhi, P. (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Dotani, T. (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Nakagawa, T. (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Isobe, N. (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Ueda, Y. (Department of Astronomy, Kyoto University) ;
  • Ichikawa, K. (Department of Astronomy, Kyoto University) ;
  • Terashima, Y. (Department of Physics, Ehime University) ;
  • Oyabu, S. (Graduate School of Science, Nagoya University) ;
  • Yamamura, I. (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Stawarz, L. (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
  • Received : 2012.07.01
  • Accepted : 2012.08.10
  • Published : 2012.09.16
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Abstract

We combine data from two all-sky surveys, the Swift/Burst Alert Telescope 22 Month Source Catalog and the AKARI Point Source Catalogue, in order to study the connection between the hard X-ray (> 10 keV) and infrared (IR) properties of local active galactic nuclei (AGN). We find two photometric diagnostics are useful for source classification: one is the X-ray luminosity vs. IR color diagram, in which type 1 radio-loud AGN are well isolated from other AGN. The second one uses the X-ray vs. IR color-color diagram as a redshift-independent indicator for identifying Compton-thick (CT) AGN. Importantly, CT AGN and starburst galaxies in composite systems can also be separated in this plane based upon their hard X-ray fluxes and dust temperatures. This diagram may be useful as a new indicator to classify objects in new surveys such as with WISE and NuSTAR.

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References

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