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Title:
The Spatial Distribution of Cold Dust in Nearby Galaxies
Authors:
Hinz, J. L.; Engelbracht, C. W.; Willmer, C. N. A.; Rieke, G. H.; Rieke, M. J.; Smith, P. S.; Blaylock, M.; Gordon, K. D.
Publication:
The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the conference held December 2-5, 2007 at the Hilton Hotel, Pasadena, CA, Eds.: K. Sheth, A. Noriega-Crespo, J. Ingalls, and R. Paladini, Published online at http://ssc.spitzer.caltech.edu/mtgs/ismevol/
Publication Date:
01/2009
Origin:
AUTHOR
Keywords:
galaxies: ISM , infrared: galaxies , infrared: ISM , ISM: dust, extinction , ISM: structure
Bibliographic Code:
2009eimw.confE...7H

Abstract

We present results from the Spitzer MIPS instrument regarding the spatial distribution of cold dust emission in a variety of nearby galaxies. Large masses of cold dust can be observed surrounding objects of varying physical size and morphological type, including galaxies quite low in mass. In several cases, the cold dust emission represented by the MIPS 160 micron images extends beyond the optical and near-infrared disks of galaxies. The amount of detectable cold dust emission is likely dependent on the amount of diffuse, nonionizing ultraviolet photons produced by the young stellar population. Therefore, many more galaxies with lower rates of star formation may have large amounts of very cold dust that escape detection. The existence of such cold dust halos allows us to probe issues regarding the assembly, storage, and retention of dust in disk galaxies and to better understand how the dust interacts with its environment. For instance, tracing gas-to-dust ratios far into disks allows us to distinguish between methods of dust production and transportation, and comparing with other wavelengths enables us to locate the sources of dust heating.
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