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Temperature Variations of the Cold Dust in the Triangulum Galaxy M33
Publications of the Astronomical Society of Japan (2011)
  • S. Komugi
  • T. Tosaki
  • K. Kohno
  • T. Tsukagoshi
  • K. Nakanishi
  • T. Sawada
  • R. Kawabe
  • H. Ezawa
  • N. Kuno
  • S. Onodera
  • Y. Tamura
  • Grant Wilson, University of Massachusetts - Amherst
  • M. S. Yun
  • K. Scott
  • T. A. Perera
  • J. E. Austermann
  • D. H. Hughes
  • I. Aretxaga
  • K. Tanaka
  • K. Muraoka
  • R. Miura
  • F. Egusa

We present wide-field 1.1 mm continuum imaging of the nearby spiral galaxy M 33, conducted with the AzTEC bolometer camera on ASTE. We show that the 1.1 mm flux traces the distribution of dust with T ~20 K. Combined with far-infrared imaging at 160um, we derive the dust temperature distribution out to a galactic radius of ~7 kpc with a spatial resolution of ~100 parsecs. Although the 1.1 mm flux is observed predominantly near star forming regions, we find a smooth radial temperature gradient declining from ~20 K to ~13 K, consistent with recent results from the Herschel satellite. Further comparison of individual regions show a strong correlation between the cold dust temperature and the Ks band brightness, but not with the ionizing flux. The observed results imply that the dominant heating source of cold dust at few hundred parsec scales are due to the non-OB stars, even when associated with star forming regions.

  • galaxies:ISM
Publication Date
Publisher Statement
This paper was harvested from and ArXiv identifier is arXiv:1106.2166
Citation Information
S. Komugi, T. Tosaki, K. Kohno, T. Tsukagoshi, et al.. "Temperature Variations of the Cold Dust in the Triangulum Galaxy M33" Publications of the Astronomical Society of Japan (2011)
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