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.
Keywords
Cite
@article{arxiv.1106.2166,
title = {Temperature Variations of the Cold Dust in the Triangulum Galaxy M33},
author = {S. Komugi and T. Tosaki and K. Kohno and T. Tsukagoshi and K. Nakanishi and T. Sawada and R. Kawabe and H. Ezawa and N. Kuno and S. Onodera and Y. Tamura and G. W. Wilson and M. S. Yun and K. Scott and T. A. Perera and J. E. Austermann and D. H. Hughes and I. Aretxaga and K. Tanaka and K. Muraoka and R. Miura and F. Egusa},
journal= {arXiv preprint arXiv:1106.2166},
year = {2015}
}
Comments
Accepted for publication in PASJ