Detailed Study of the Dust in M31's Four Elliptical Companions

Details Detailed Study of the Dust in M31's Four Elliptical Companions Detailed Study of the Dust in M31's Four Elliptical Companions

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20173m&link_type=abstract

Spitzer Proposal ID #20173

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Scientific paper

We propose to carry out a multi-wavelength study of the four dwarf/compact elliptical galaxies, NGC 205, NGC 185, NGC 147 and M32, the well known satellites of M31. The distinct properties of these systems -- different gravitational interactions, star forming histories and interstellar medium (ISM) -- create a unique opportunity to learn about the evolution of the ISM in these galaxies and the processes that regulate its state. The proposed IRAC (3.6-8 micron) and MIPS (24, 70 and 160 micron) observations of NGC 185, NGC 147 and M32 will trace simultaneously the distribution of the dust and the old stellar population. For NGC 205, for which we have GTO MIPS observations, we will obtain new IRAC maps, 16 micron IRS peakup imaging and deeper MIPS photometric observations. These new observations will provide a complete census of the extended emission, and therefore, of the dust distribution in this galaxy. In the case of NGC 205 and NGC 185, where dust emission has already been detected, current (NGC 205) and proposed (NGC 185) observations will be supplemented by IRS spectroscopy (5.2 to 38 micron) of the dust clouds. These observations will enhance our knowledge of the infrared emission and dust properties in dwarf/compact elliptical systems and how they compare with those of the Galaxy and other elliptical galaxies.

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