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The Korean Astronomical Society (한국천문학회)
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PROPERTIES OF DUST OBSCURED GALAXIES IN THE NEP-DEEP FIELD

  • Oi, Nagisa (Department of Infrared Astrophysics Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Matsuhara, Hideo (Department of Infrared Astrophysics Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency) ;
  • Pearson, Chris (Department of Physical Sciences, The Open University) ;
  • Buat, Veronique (Aix-Marseille Universite, CNRS, LAM (Laboratoire d'Astrophysique de Marseille)) ;
  • Burgarella, Denis (Aix-Marseille Universite, CNRS, LAM (Laboratoire d'Astrophysique de Marseille)) ;
  • Malkan, Matt (Department of Physics and Astronomy, UCLA) ;
  • Miyaji, Takamitsu (Universidad Nacional Autonoma de Mexico) ;
  • AKARI-NEP team (Department of Infrared Astrophysics Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
  • Received : 2015.07.23
  • Accepted : 2016.10.20
  • Published : 2017.03.31
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Abstract

We selected 47 DOGs at z ~ 1.5 using optical R (or r'), AKARI $18{\mu}m$, and $24{\mu}m$ color in the AKARI North Ecliptic Pole (NEP) Deep survey field. Using the colors among 3, 4, 7, and 9µm, we classified them into 3 groups; bump DOGs (23 sources), power-law DOGs (16 sources), and unknown DOGs (8 sources). We built spectral energy distributions (SEDs) with optical to far-infrared photometric data and investigated their properties using SED fitting method. We found that AGN activity such as a AGN contribution to the infrared luminosity and a Chandra detection rate for bump and power-law DOGs are significantly different, while stellar component properties like a stellar mass and a star-formation rate are similar to each other. A specific star-formation rate range of power-law DOGs is slightly higher than that of bump DOGs with wide overlap. Herschel/PACS detection rates are almost the same between bump and power-law DOGs. On the other hand SPIRE detection rates show large differences between bump and power-law DOGs. These results might be explained by differences in dust temperatures. Both groups of DOGs host hot and/or warm dust (~ 50 Kelvin), and many bump DOGs contain cooler dust (${\leq}30$ Kelvin).

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References

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