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The Korean Astronomical Society (한국천문학회)
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INFRARED - X-RAY CONNECTION IN NEARBY ACTIVE GALACTIC NUCLEI; AKARI AND MAXI RESULTS

  • Isobe, Naoki (Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)) ;
  • Nakagawa, Takao (Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)) ;
  • Yano, Kenichi (Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)) ;
  • Baba, Shunsuke (Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)) ;
  • Oyabu, Shinki (Graduate School of Science, Nagoya University) ;
  • Toba, Yoshiki (Research Center for Space and Cosmic Evolution, Ehime University) ;
  • Ueda, Yoshihiro (Department of Astronomy, Kyoto University) ;
  • Kawamuro, Taiki (Department of Astronomy, Kyoto University)
  • Received : 2015.06.29
  • Accepted : 2016.10.21
  • Published : 2017.03.31
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Abstract

Combining the AKARI Point Source Catalog and the 37-month Monitor of All-sky X-ray Image (MAXI) catalog, the infrared and X-ray properties of nearby active galactic nuclei were investigated. The 37-month MAXI catalog tabulates 100 nearby Seyfert galaxies, 73 of which are categorized into Seyfert I galaxies. Among these Seyfert galaxies, 69 ones were found to have an AKARI infrared counterpart. For the Seyfert I galaxies in this sample, a well-known correlation was found between the infrared and X-ray luminosities. However, the observed X-ray luminosity of the Seyfert II galaxies tends to be lower for the infrared luminosity than the Seyfert I galaxies. This suggests that the X-ray absorption is significant in the Seyfert II galaxies. The Seyfert II galaxies seem to have a bimodal distribution of the IR color between $18{\mu}m$ and $90{\mu}m$. Especially, a large fraction of the Seyfert II galaxies exhibits a redder IR color than the Seyfert I galaxies. A possible origin of the redder IR color is briefly discussed, in relation to the star formation activity in the host galaxy, and to the X-ray absorption.

Keywords

References

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