Hot Dust in ULIRGs: Completing Spitzer's Legacy

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Ultraluminous Infrared Galaxies (ULIRGs) have the power output of quasars, yet they emit nearly all of their energy in the mid to far-infrared. While rare in the local Universe, ULIRGs play an increasingly important role in the evolving star formation rate density at high redshift, and they may account for a major fraction of the far-infrared background. Nearly 200 low-redshift ULIRGs have been observed with the IRS on Spitzer during the cryogenic phase of the mission. The IRS spectra of ULIRGs show a great diversity in their properties (slopes, emission line ratios, PAH strengths, extinction), and when coupled with near-infrared and far-infrared photometry, they have been used to quantify the amount of energy produced by AGN and starbursts. The 2-5 micron window is critical for measuring the contribution of hot (~1000K) AGN-heated dust to the emerging SED, yet nearly half of the ULIRGs observed with the IRS have no existing IRAC photometry to cover this wavelength range. Here we propose to complete the Spitzer observations of this important population by observing 83 ULIRGs and 23 PG QSOs (used as templates to understand the hot dust contribution in ULIRGs) with IRAC at 3.6 and 4.5 microns to fill in the missing part of their SEDs, and provide a lasting mid-infrared legacy for studies of ULIRGs and AGN at high-redshift with future generations of IR facilties.

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