Mathematics – Logic
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..197m&link_type=abstract
NOAO Proposal ID #2009B-0197
Mathematics
Logic
Scientific paper
Dust emission in Luminous Infrared Galaxies (LIRGs) produces total IR luminosities in excess of 10^11 L_&sun;. In the local universe the LIRG population is dominated by mergers, especially at the high luminosity end. Mergers drive central star formation and AGN activity both of which heat dust. At lower luminosities, however, 50% of LIRGs appear to be morphologically normal disk galaxies, and the fraction of LIRGs classfied as disks increases to higher redshifts (i.e. z=1). Spitzer imaging shows that within their extended disks, the LIRGs have similar dust properties as normal disk galaxies. However dust in the cores of LIRG disks shows additional heating. We propose to image LIRG disks with TReCS and Michelle in both the 8.8(micron) PAH feature and in a broad 18(micron) filter to localize the regions producing the dust heating in the cores of low redshift LIRG disks. TReCS on Gemini will provide a factor of 10 improvement in resolution over Spitzer, allowing us to differenciate between dust heated in extended regions from dust heated in a point-like nuclear core.
Armus Lee
Howell Justin
Mazzarella Joe
Melbourne Jason
Surace Jason
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