High spatial resolution mid-infrared imaging of Local Universe Luminous Infrared Galaxies

Details High spatial resolution mid-infrared imaging of Local Universe Luminous Infrared Galaxies High spatial resolution mid-infrared imaging of Local Universe Luminous Infrared Galaxies

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop...79p&link_type=abstract

NOAO Proposal ID #2006B-0079

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Scientific paper

Recent Spitzer cosmological surveys have demonstrated that the majority of IR-selected galaxies at z< 1 are in the LIRG class (L_IR=L[8-1000(mu) m]=10^11-10^12 L_&sun;) and that LIRGs make a significant contribution to the IR galaxy population at 1< z< 2. We propose to obtain T-ReCS Si2 (8.7 (mu)m) narrow-band imaging of a sample of six low-z LIRGs. These galaxies are part of a complete volume (v< 5200 km s^-1) limited sample of LIRGs for which we have obtained HST/NICMOS images to identify star clusters and H II regions. The sample covers different morphologies and a range of IR luminosities. The combination of high spatial resolution (~eq 0.3 arcsec) mid-IR imaging and spectroscopy (the latter to be proposed in the coming semesters) uniquely afforded by 8 m class telescopes, and NICMOS observations will allow us to peer for the first time into the dust-enshrouded nuclear regions of LIRGs with the appropriate spatial resolution (50-135 pc). Our goals are: (1) to identify heavily obscured AGN, not detected in the optical and near-IR, (2) to calibrate the mid-IR emission as a tracer of the star formation rate, (3) to investigate the nature of the dominant energy source (AGN vs stellar emission), and (4) to produce local templates to be compared with the high-redshift bright-IR sources currently being detected by Spitzer.

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