Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20356b&link_type=abstract
Spitzer Proposal ID #20356
Other
Scientific paper
We propose to obtain IRAC and MIPS imaging and an IRS spectral map of the nearby (~ 2 - 3 Mpc) extremely metal-poor (12 + log(O/H) = 7.43) blue dwarf galaxy CGCG 269-049. This object offers an unprecendented opportunity to study an extremely metal-poor galaxy at high spatial resolution, as it has a major axis of approximately 40". Spitzer data will establish whether this object contains a large amount of dust indicative of past episodes of star formation, which will in turn indicate whether or not it is forming its first generation of stars. The proposed observations will also establish whether, like some other blue dwarf galaxies, CGCG 269-049 contains dust-obscured super star clusters that are redistributing its flux to the mid-infrared. The IRS spectral map will reveal any spatial variation in the properties of the galaxy's dust, such as temperature, grain size, and the presence of PAHs. This will in turn aid in the interpretation of the mid-IR spectra of more compact blue dwarf galaxies, whose spectra represent their spatially-integrated emission.
Burstein David
Corbin Michael
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