Exploring the Nature of Dust in the Outer Disks of Galaxies

Details Exploring the Nature of Dust in the Outer Disks of Galaxies Exploring the Nature of Dust in the Outer Disks of Galaxies

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3393z&link_type=abstract

Spitzer Proposal ID #3393

Computer Science

Scientific paper

We propose an exploratory study of the extended disks (r > R_25) of spiral galaxies. Observations suggest that dust (and star formation) exist in spiral galaxies well beyond the edge of the optical disk. This extended disk region may eventually play an important role in our understanding of how material infalls onto galaxies, how star formation is regulated in low-density regions, how the initial chemical enrichment of galaxies proceeds, and how angular momentum is distributed in the baryonic component of galaxies. In the proposed study, MIPS 70 and 160 micron photometry of the outer regions of two galaxies will be used to formulate an understanding of this material at high spatial resolution (including the density and temperature structure). If successful, this program will lay the groundwork for the study of a new disk component of spiral galaxies.

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