Temperature variations of cold dust in the triangulum galaxy M 33

Shinya Komugi, Tomoka Tosaki, Kotaro Kohno, Takashi Tsukagoshi, Kouichiro Nakanishi, Tsuyoshi Sawada, Ryohei Kawabe, Hajime Ezawa, Nario Kuno, Sachiko Onodera, Yoichi Tamura, Grant W. Wilson, Min S. Yun, Kimberly S. Scott, Thushara A. Perera, Jason E. Austermann, David H. Hughes, Itziar Aretxaga, Kunihiko Tanaka, Kazuyuki MuraokaRie Miura, Fumi Egusa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We present wide-field 1.1mm continuum imaging of the nearby spiral galaxy M 33, conducted with the AzTEC bolometer camera on ASTE.We show that the 1.1mm flux traces the distribution of dust with T ̃ 20K. Combined with far-infrared imaging at 160μm, we derived the dust temperature distribution out to a galactic radius of ̃7 kpc with a spatial resolution of ̃150 pc. Although the 1.1mm flux was observed predominantly near star-forming regions, we found a smooth radial temperature gradient declining from ̃20K to ̃13K consistent with recent results from the Herschel satellite. Further comparisons 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 is due to non-OB stars, even when associated with star-forming regions.

Original languageEnglish
Pages (from-to)1139-1150
Number of pages12
JournalPublications of the Astronomical Society of Japan
Issue number5
Publication statusPublished - 2011 Oct 25


  • Galaxies: Dust
  • Galaxies: ISM
  • Galaxies: Individual (M 33)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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