Pushing the Far-IR Capability of Spitzer in the Study of High-Redshift ULIRGs

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Scientific paper

We propose deep MIPS 70 and 160 micron observations of a sample of submillimeter-selected high-redshift ultraluminous infrared galaxies (ULIRGs). For the first time, we will explore the diversity of their far-infrared spectral distributions -- in particular, on the Wien side of the graybody peak -- and measure accurately the integrated infrared luminosity. The targets are drawn from a sample of 850 micron sources at z > 1 amplified by foreground galaxy clusters, where the lensing allows us to measure galaxies which would otherwise be too faint for detection and may also lower the confusion noise. Our program is complemented by ground-based 350 micron imaging, which quantifies the graybody spectrum.

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