Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20138s&link_type=abstract
Spitzer Proposal ID #20138
Other
Scientific paper
The SINGS legacy survey is collecting a remarkable dataset for a large sample of nearby galaxies. Due to time constraints, however, the spectral data are limited. Except for the nucleus and a few selected HII regions, no SINGS galaxy has a full 5--37 micron spectral coverage across a galactic disk. The LL strips across the disks cover 14--37 microns missing most of the PAH features and other important spectral diagnostics limiting the use of the broadband data. This leaves open important questions about the state of the interstellar medium and the radial and regional variations across the disk. We propose to study the complete mid-infrared spectrum at low resolution (SL+LL) across the disk of the well studied, face-on, grand design spiral M51. We also propose to exploit the new peak-up imaging mode to obtain a 16 micron map of M51 to trace the dust continuum and determine the true PAH strengths. We chose M51 not only because it has a wealth of ancillary data but also because we have recently acquired a complete single dish + interferometer CO mosaic and 4, 6 and 20 cm radio continuum maps. This rare combination of data is well suited for a detailed study of the ISM as the CO traces the molecular gas and the radio continuum traces (extinction-free) star formation. We will combine these data with the proposed mid-infrared spectral data to determine the variations in the dust continuum and PAH emission as a function of radius and environment, the change in the ISM density, radiation field and grain size, and the change in the fraction of warm molecular gas across the disk. With this study M51 will be the spectral template for interpreting the wealth of broadband infrared data on nearby galaxies, and for improving our understanding of the dust content and dust properties of high redshift galaxies that are derived from rest-frame mid-infrared emission studies.
Armus Lee
Dale Daniel
Helou George
Schinnerer Eva
Sheth Kartik
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