A bridge between ultraluminous and normal galaxies at high redshifts: Spitzer imaging of a unique spectroscopic radio field

Details A bridge between ultraluminous and normal galaxies at high redshifts: Spitzer imaging of a unique spectroscopic radio field A bridge between ultraluminous and normal galaxies at high redshifts: Spitzer imaging of a unique spectroscopic radio field

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20216b&link_type=abstract

Spitzer Proposal ID #20216

Computer Science

Scientific paper

Ultradeep radio images and Spitzer maps both provide windows on the high-redshift Universe immune to the effects of dust extinction. The very deepest radio sources trace the evolution of star-formation activity at luminosities less than the confusion limit in submm and far-IR surveys, opening a bridge between the most extreme submm-selected galaxies and the optically-selected Lyman-break population: the galaxies at 100-1000 Giga solar luminosities that dominate the far-IR background. We are targeting a VLA image in the Lockman Hole that goes twice as deep as the GOODS-N radio map for complete spectroscopy of the 250 radio sources to build up a compact, densely-sampled 15-arcmin field. These spectra will yield an unparalleled view of both the rate of evolution and the large-scale structure traced by dust-obscured galaxies. Spitzer IRAC and MIPS imaging of this special field will allow an unprecedented census of the rate and spatial distribution of dust-enshrouded high-redshift star formation activity, with MIPS revealing details of the galaxy SEDs, and the relationship between radio and far-IR emission, while IRAC reveals the stellar masses built up in the dust-enshrouded galaxies that could provide the link between current optical and far-IR samples, and which make most of the stars in the Universe today.

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