Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20120h&link_type=abstract
Spitzer Proposal ID #20120
Other
Scientific paper
Low-luminosity galaxies are deficient in PAH emission; it is not known why. Whether the deficiency is a metallicity effect, some property of radiation fields, or a consequence of dust geometry or dust properties, the question requires observations of low-luminosity galaxies that span the space of physical properties. We propose IRAC imaging and IRS SL spectroscopy of a uniformly selected sample of 29 extremely low luminosity (M_r > -15 mag) galaxies selected from the Sloan Digital Sky Survey. Comparison of Spitzer observations of different low-luminosity galaxies and comparison of low-luminosity and high-luminosity galaxies from the SINGS Legacy Program (particularly their outskirts) ought to break the current degeneracy of possible explanations for the PAH deficiency. Our sample of low-luminosity galaxies has been selected completely independently of environment, making it a unique sample for the study of galaxy formation and evolution; the data taken for this project will have great legacy value. We are also obtaining HST imaging, H-alpha rotation curves, and HI measurements for this sample, allowing myriad studies of the physics of galaxy evolution. We waive all proprietary period on these Spitzer observations and all of the other data we have for this sample.
Blanton Michael R.
Hogg David
Masjedi Morad
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