The Redshift Distribution of 24 micron sources in the NDWFS Bootes Field

Astronomy and Astrophysics – Astronomy

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Scientific paper

The 9 square degree Bootes field of the NOAO Deep Wide-Field Survey (NDWFS) has been mapped with both the IRAC and MIPS instruments on board the Spitzer Space Telescope, complementing deep groundbased optical imaging. I will present the results of an optical spectroscopic survey of 24 micron sources in Bootes carried out with the DEIMOS and LRIS instruments on the Keck telescope. The approximately 550 targets represent an unbiased sample of 24 micron sources down to 0.3 mJy. We obtained redshifts for 70% of the targets, the remainder being optically faint (R>23 mag). The peak of the resulting redshift distribution occurs at z = 0.8 and is dominated by LIRGs, with the number of ULIRGs growing rapidly at z>1. Existing models of the evolution of infrared sources based on number counts and the infrared background differ on the nature of the optically faint targets without redshifts, predicting they are predominantly either LIRGs at z=1 or ULIRGs at z=2.

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