Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30073h&link_type=abstract
Spitzer Proposal ID #30073
Other
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 redshifts, ULIRGs are responsible for the strong evolution in the mid-infrared 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 IRS. Many of these sources do not have near-infrared photometry to supplement the IRS spectroscopy. Others, in particular the more redshifted ULIRGs, do not have a proper sampling of their rest frame far-infrared spectral energy distributions. We hence to propose to obtain IRAC 3.6 micron and MIPS 70 & 160 micron photometry for 1/3 of our ULIRGs, to extend their spectral energy distributions, required for proper modeling of their complex dust continuum spectra. In addition, we would like to re-observe the IRS SL2 spectra of two of our ULIRGs at higher signal-to-noise to obtain good profiles of the broad 4.6 micron CO absorption profiles in their spectra. So far, these features have been discovered in only a handful of ULIRGs. Their origin is not yet understood. We further propose to obtain IRS low-resolution spectroscopy of the distant ULIRG IRAS 23515-2917, which -- judging from previous ISO spectroscopy -- is likely deeply obscured and may show signatures for the presence of crystalline silicates in its spectrum.
Houck James R.
Spoon Henrick
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