Computer Science
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..31j&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Computer Science
Galaxies: Ism, Infrared: Galaxies, Infrared: Ism, Ism: Dust, Ism: Extinction, Ism: Structure
Scientific paper
SSGSS is a Spitzer Legacy program of IRS observations of 101 galaxies uniformly selected from the SDSS (median redshift ˜ 0.08). The comprehensive UV through IR imaging and spectroscopy of a representative sample of galaxies in the local universe will provide an ideal dataset for the testing of models that self consistently treat stellar populations, dust absorption, and dust emission. The IRS slits are well-matched to the SDSS spectroscopic aperture, and in the most cases sample the majority of emission of each galaxy. Mid-IR indicators of PAH abundance, dust temperature and luminosity, and AGN activity derived from the SSGSS data may be compared to optical and UV indicators of star formation, stellar mass, dust attenuation, metallicity, and AGN activity. As an example, we explore how PAH feature strength ratios vary with optical diagnostics of HII regions, and the variation of the IR continuum shape with the stellar population `age' in galaxies. We also determine a simple scaling between the 7.7 micron~PAH feature emission strength and the optically derived star formation rate.
Johnson Benjamin D.
Meder K.
O'Dowd Matt
Schiminovich David
Treyer Marie
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