AAS 207th Meeting, 8-12 January 2006
Session 63 From Here to Eternity: The Spitzer Legacy Programs
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[63.06] MIPS mid-IR and radio measurements of star formation at z ~ 1 in the Great Observatories Origins Deep Survey

E. C. MacDonald, M. E. Dickinson (NOAO), G. E. Morrison (IfA-UHawaii/CFHT)

At present, most investigations of high redshift star formation using Spitzer (or ISO) mid-infrared data adopt mid- to far-infrared correlations derived from local galaxy samples. Direct tests of these correlations at high redshift are scarce. In fact IR galaxies at high z may have spectral energy distributions that differ significantly from those of local galaxies, rendering a simple redshifting of local IR SED's inappropriate. The Great Observatories Origins Deep Survey (GOODS), with its multi-wavelength data set, allows for the investigation of how higher redshift IR galaxies compare with galaxies locally. In particular, the work to be presented here uses recently obtained VLA radio data and MIPS 24 micron data to derive the 12 micron versus bolometric IR (LIR) relation for a large sample of galaxies at z ~ 1. Locally, this tight correlation is well defined, however at z of 1 there appears to be evidence for a population of IR galaxies that does not adhere to this relationship. This poster presents these results, along with a discussion of the nature of IR galaxies at high z, and the implications of using model SED’s derived from local IR galaxies at higher z.

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