Temperature Variations of the Cold Dust in the Triangulum Galaxy M33

Abstract

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.

Accepted for publication in PASJ

References in corpus (14)

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• LABOCA observations of nearby, active galaxies
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• The evolution of the cold interstellar medium in galaxies following a starburst
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• Herschel-ATLAS: Correlations between Dust and Gas in Local Submm-Selected Galaxies
• Enhancement of CO(3-2)/CO(1-0) Ratios and Star Formation Efficiencies in Supergiant HII Regions
• The 1.1 mm Continuum Survey of the Small Magellanic Cloud: Physical Properties and Evolution of the Dust-selected Clouds
• Continuum Observations of M51 and M83 at 1.1 mm with AzTEC
• Gas, Dust, Stars, Star Formation and their Evolution in M33 at Giant Molecular Cloud Scales
• 12CO and 13CO observation of the low-metallicity dwarf galaxy DDO 154
• A multiwavelength analysis of the clumpy FIR-bright sources in M33
• The Dust-Selected Molecular Clouds in the Northeast Region of the Small Magellanic Cloud