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The Korean Astronomical Society (한국천문학회)
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INFRARED SPECTRAL ENERGY DISTRIBUTION OF GALAXIES IN THE AKARI ALL SKY SURVEY: CORRELATIONS WITH GALAXY PROPERTIES AND THEIR PHYSICAL ORIGIN

  • Makiya, R. (Department of Astronomy, School of Science, Kyoto University) ;
  • Totani, T. (Department of Astronomy, School of Science, Kyoto University) ;
  • Takeuchi, T.T. (Institute for Advanced Research, Nagoya University) ;
  • Nagashima, M. (Faculty of Education, Nagasaki University) ;
  • Kobayashi, M.A.R. (Optical and Infrared Astronomy Division, National Astronomical Observatory)
  • Received : 2012.07.03
  • Accepted : 2012.08.22
  • Published : 2012.09.16
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Abstract

We will report our recent study on the properties of more than 1,600 galaxies detected by the AKARI All-Sky Survey with physical quantities based on optical and 21-cm observations, to understand the physics determining the infrared spectral energy distribution (Totani et al., 2011). We discover a tight linear correlation for normal star-forming galaxies between the radiation field strength of dust heating (corresponding to dust temperature) and the galactic-scale infrared radiation field, $L_{TIR}/R^2$. This is the tightest correlation of dust temperature ever known, and the dispersion along the mean relation is 13% in dust temperature. This relation can be explained physically by a thin layer of heating sources embedded in a thicker, optically-thick dust screen. We also find that the number of galaxies sharply drops when galaxies become optically thin against dust-heating radiation, indicating that a feedback process to galaxy formation (e.g., by the photoelectric heating) is working when dust-heating radiation is not self-shielded on a galactic scale. We discuss implications from these findings for the $M_{H_I}$ -size relation, the Kennicutt-Schmidt relation, and galaxy formation in the cosmological context.

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References

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