A survey of galaxy mass assembly at 1.5 < z < 3 via faint GOODS 24(micron) sources

Details A survey of galaxy mass assembly at 1.5 < z < 3 via faint GOODS 24(micron) sources A survey of galaxy mass assembly at 1.5 < z < 3 via faint GOODS 24(micron) sources

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..580d&link_type=abstract

NOAO Proposal ID #2006A-0580

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Scientific paper

Current evidence strongly points to the redshift range 1 < z < 3 as the era when most of the stars in the Universe were formed. The GOODS Spitzer Legacy program is mapping this process, with observations at 3-8 (micron) to measure the stellar masses of galaxies, and the deepest MIPS 24(micron) data to study dusty star formation with much greater sensitivity than is possible at other wavelengths. We have recently shown that a large fraction (> 50%) of massive (stellar M_* ~ 10^11 M_&sun;) galaxies at 1.5 < z < 3 are detected by Spitzer at 24(mu)m, with implied < L_IR > > 10^12 L_&sun;, or average star formation rates > 170 M_&sun;/year. The high fraction implies a large duty cycle: massive galaxies were growing rapidly in that era. However, at present this result relies mainly on color selection and photometric redshifts. Spectroscopic redshifts are essential due to the complex k-corrections arising from the very strong mid-IR emission & absorption bands. We propose to measure redshifts for ~ 180 non-Xray 24(micron) sources at z > 1.5, which will more than triple the sample now known, and enable us to compare the MIPS measurements against radio & other multiwavelength data in order to calibrate 24(mu)m-derived star formation rates.

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