Dust at Low-Metallicity: A Spitzer Survey of Local Group Dwarf Galaxies

Details Dust at Low-Metallicity: A Spitzer Survey of Local Group Dwarf Galaxies Dust at Low-Metallicity: A Spitzer Survey of Local Group Dwarf Galaxies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011405j&link_type=abstract

American Astronomical Society Meeting 210, #114.05; Bulletin of the American Astronomical Society, Vol. 39, p.239

Astronomy and Astrophysics

Astronomy

Scientific paper

The results of our Spitzer Space Telescope near-, mid-, and far-infrared survey of Local Group star forming dwarf galaxies is presented. We present the first ever spatially resolved maps of the distributions and temperature structures of dust in these galaxies. We investigate the emission from hot dust and polycyclic aromatic hydrocarbons and, using pan-chromatic data, rule out many commonly cited physical causes for the lack of PAH emission in low-metallicity systems. We compare current star formation rates derived using UV, ionized hydrogen, and far-infrared star formation indicators and show the effects that a galaxy's dust content has on these three methods as a function of metallicity. We also present a complete census of the asymptotic giant branch stellar populations of three nearby dwarf irregular galaxies: WLM, IC 1613, and Sextans A. These data are compared with ground based optical studies to determine the fraction of AGB stars not detected in the optical due to extinction by circumstellar material and investigate the return of material back into the ISM from AGB mass-loss.

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