Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50702a&link_type=abstract
Spitzer Proposal ID #50702
Computer Science
Scientific paper
The Great Observatory All-sky LIRG Survey (GOALS) targets a complete sample of 203 LIRGS in the local Universe, selected from the IRAS Revised Bright Galaxy Sample (RBGS). The RBGS is a complete sample of 629 galaxies with IRAS 60-micron flux densities above 5.24 Jy, covering the full sky above Galactic latitudes |b| > 5 degrees. The RBGS objects are the brightest 60-micron sources in the extragalactic sky, and they span a wide range in morphologies from normal, isolated gas-rich spirals to full mergers. The sample includes numerous nuclear starbursts, Type 1 and 2 Seyfert nuclei, and LINERS. These systems are the best local analogs for comparisons with infrared and sub-mm selected galaxies at high redshift. In Cycles 1 and 3 we were awarded time to image the GOALS sample with IRAC and MIPS, and to obtain nuclear spectra with the IRS. The cycle-3 observations formed the core of a Spitzer Legacy program to obtain and make available IRS nuclear spectra of the GOALS targets. Here we propose to extend and enhance the Spitzer observations of the GOALS sample by obtaining IRS maps in the low-resolution SL and LL slits of 81 LIRGs (in 61 systems) which are close, bright, and highly resolved with IRAC. The primary goals of this proposal are to construct IRS spectral maps which will enable us to (1) explore the ionization state, small and large grain dust properties, and warm molecular gas over the full extent of LIRGs covering a wide range in luminosity and interaction state, and (2) create globally integrated SEDs which, when combined with the existing Spitzer, HST, VLA, NIR, ground-based optical, and proposed Herschel imaging data, will allow us to extend the photometry and spectra from the UV through the radio on matched spatial scales. These spectral maps will complete an unprecedented mid-infrared spectroscopic and photometric survey of luminous infrared galaxies in the local Universe. The total requested time for this program, including all overheads, is 111 hrs.
Armus Lee
Chan Ben
Charmandaris Vassilis
Evans Aaron
Frayer David
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