IRS Spectral Mapping of a Representative Sample of Local Luminous Infrared Galaxies

Details IRS Spectral Mapping of a Representative Sample of Local Luminous Infrared Galaxies IRS Spectral Mapping of a Representative Sample of Local Luminous Infrared Galaxies

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30577r&link_type=abstract

Spitzer Proposal ID #30577

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We propose to measure the mid-infrared spectroscopic properties (using the IRS Spectral Mapping mode with the low and high spectral resolution modules) of a representative sample of local universe luminous infrared galaxies (LIRGs). Current Spitzer cosmological surveys at 24micron are revealing a population of high-z LIRGs that account for nearly 50% of the cosmic IR background at z~1 . The interpretation of these distant LIRGs depends on a deep understanding of local LIRGs. The sample of 12 local LIRGs has been selected to be representative of a volume-limited sample (distances of 35 to 76Mpc) for which HST/NICMOS continuum and Pa-alpha observations were obtained in Cycle 13. In addition, there are archival IRAC and MIPS observations for the sample. The regions to be mapped with the IRS (central 20-30arcsec) cover the majority of the mid-IR emitting area of these LIRGs, so the entire set of HST and Spitzer data can be converted into integrated properties. The goals of this proposal are: (1) To use the high spectral resolution modules to look for high excitation lines to reveal obscured AGN, and to determine the nature of the dominant energy source when both AGN and star formation are present, as observed in a large fraction of high-z LIRGs and ULIRGs (2) To calibrate the mid-IR star formation rate indicators, such as the 24micron luminosity, the [NeII]12.8micron emission line, and the aromatic emission features for LIRGs and compare them with the behavior of normal galaxies (3) to characterize the obscuration and to understand the properties of the star-forming regions of LIRGs, and compare them with less extreme cases such as starburst galaxies from SINGS (4) to construct local templates for high-z IR bright galaxies.

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