Of Starbursts and Monsters: An IRS High-resolution Spectroscopic Study of Ultraluminous Infrared Galaxies

Details Of Starbursts and Monsters: An IRS High-resolution Spectroscopic Study of Ultraluminous Infrared Galaxies Of Starbursts and Monsters: An IRS High-resolution Spectroscopic Study of Ultraluminous Infrared Galaxies

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20375a&link_type=abstract

Spitzer Proposal ID #20375

Physics

Scientific paper

Ultraluminous infrared galaxies (ULIRGs) generate the power output of quasars, but nearly all of this energy emerges in the mid and far-infrared part of the spectrum. While rare at low-redshift, ULIRGs are resposible for the strong evolution in the mid-IR number counts to z~1, and may dominate the star formation rate density and far-infrared background at z~2-3. The GTO ULIRG program is observing a sample of 110 ULIRGs in the local universe with the IRS. Less than half of these have observations with the high-resolution IRS modules. We propose to observe a sample of 34 ULIRGs from this program in SH and/or LH in order to search for unambiguous proof of buried AGN (via the [NeV] emission line), as well as characterize the warm molecular gas content, the small grain characterisitics and the starburst mass functions, via the H2, PAH, and [NeII], [NeIII], [OIV], [SIV], and [SIII] line flux ratios in the SH and LH IRS spectra. These observations will double the number of ULIRGs will high quality, high-resolution IRS spectra in the archive, and significantly increase the number of ULIRGs observed at z > 0.3, where most of the evolution in the counts of IR-bright galaxies is occuring.

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