Exploring the Nature of Dust in the Extreme Outer Disks of Spiral Galaxies

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

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20321z&link_type=abstract

Spitzer Proposal ID #20321

Computer Science

Scientific paper

Observations have demonstrated 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 into 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 24 and 70 micron photometry of the outer regions of five galaxies will be used to formulate a high spatial resolution understanding of this material (including the density and temperature structure). This program builds on the successful detection of dust knots at 70 microns in the extended disk of NGC 6946 from a Cycle 1 exploratory study.

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