The Evolution of the 24 Micron Luminosity Function from Large Wide-field Spectroscopic Samples of Spitzer Galaxies

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Scientific paper

We propose for archival funding to use existing deep, wide-area Spitzer imaging to study the evolution in the low-redshift 24 micron luminosity function. Our group has obtained the world's largest sample of wide-field spectroscopy in Spitzer fields through an ambitious survey with the Hectospec multi-fiber spectrograph on the MMT. We have measured 1200 redshifts for 24 micron-selected galaxies in the 4 sq. degree Spitzer First-Look Survey (FLS) field and 9000 galaxies in the 9 sq. degree NOAO deep-wide Bootes field (including 1000 24 micron-selected sources). The focus of this proposal is to study the local IR luminosity function and its evolution to moderate redshifts using this large spectroscopic data set combined with roughly 2000 SDSS spectra in fields of the SWIRE Legacy survey. We will also use the spectroscopic dataset to study the 24 micron emission as a function of the optical rest-frame color and optical luminosity. As a data product from this proposal, we will provide the full spectroscopic catalog of redshifts for Spitzer-selected sources in the FLS field through the SSC (as well as electronic versions of peer-review journals) in time to support the Spitzer CP-3, greatly increasing the archival value of the Spitzer data before the end of the Spitzer mission.

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