Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40591r&link_type=abstract
Spitzer Proposal ID #40591
Other
Scientific paper
We propose to dissect the mid-IR SED of the Local Group galaxy M33 using IRS spectra to learn the physical properties of the different regions that contribute to the total mid-IR flux of M33. M33 is an ideal galaxy to study the relative contributions of different sources to the total flux in the disks of galaxies as it is the closest late type spiral. The IRS spectra will provide diagnostics of the excitation conditions in both the bright HII regions and the fainter diffuse regions. Although compact sources dominate our visual impression of galaxies, the diffuse regions make up over 50% of the total flux of M33 from 8 to 160 micron. A similar portion is likely to hold for other spirals: these relatively unstudied regions therefore make an major contribution to the SED and total IR power from spiral galaxies. For example, these diffuse regions also dominate the IR color-color space of M33 that was used to pick the diffuse targets for this proposal. Since the total IR power and SED colors are the most widely used parameters to characterize the integrated IR emission of galaxies, understanding of the behavior of the diffuse regions is an essential step toward improving our understanding of IR galaxies.
Barmby Pauline
Engelbracht Charles
Gordon Karl
Misselt Karl
Rieke George
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