Spitzer Mid-Infrared Observations of Blue Compact Dwarf Galaxies

Details Spitzer Mid-Infrared Observations of Blue Compact Dwarf Galaxies Spitzer Mid-Infrared Observations of Blue Compact Dwarf Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917802w&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #178.02; Bulletin of the American Astronomical Society,

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Blue Compact Dwarf Galaxies (BCDs) are galaxies that are characterized by their blue optical colors, low luminosities and small sizes. BCDs are found to typically have have low, subsolar, metallicities. IZw18, the archytype of BCDs, is one of the most metal-poor galaxies in the local universe, only recently losing the record of the lowest metallicity galaxy, and may represent a truly young galaxy. It has now has been observed with all three instruments on Spitzer. We will present our detailed analysis on the dust and star formation properties based on the new mid-infrared imaging and spectroscopic data.
We will also expand the discussion to a larger sample of BCDs, ranging in metallicity from 1/50 to half solar. A number of ionic line emission detected in their high-resolution mid-infraredspectra, consistent with a hard radiation field from massive young stars. We explore their extinction, excitation and abundances in this study and present results of our findings within the context of other star forming galaxies.
*The IRS was a collaborative venture between Cornell University and Ball Aerospace Corporation funded by NASA through the Jet Propulsion Laboratory and the Ames Research Center.

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