Extended Dust in M31: MIPS Imaging to the HI Edge

Details Extended Dust in M31: MIPS Imaging to the HI Edge Extended Dust in M31: MIPS Imaging to the HI Edge

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30203r&link_type=abstract

Spitzer Proposal ID #30203

Computer Science

Scientific paper

We are proposing to extend the existing MIPS/GTO map of M31 from 1x3 degrees to approximately 1x5 degrees. The existing MIPS map covers the optical disk of M31 and clearly shows extended infrared emission to the edge of the current map along the major axis. HI observations of M31 also show that the HI disk extends well beyond the optical disk of M31, and the extended emission detected by MIPS supports an extended gas *and* dust disk of M31. The MIPS observation proposed here will complete the MIPS mapping of M31 out to the HI edge. Such observations will reveal the spatial distribution of cold dust in the extended HI disk. The spatial correlation of the MIPS emission with existing HI and GALEX ultraviolet images of M31 will probe the origin of the extended dust disk. Is it due to local star formation, fountains from inner disk star formation, interactions, or primordial infall? The answer(s) to these questions will provide insight on galaxy evolution and similar observations of more distant galaxies with MIPS.

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