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A Clash of Clusters Provides New Clue to Dark Matter
Special ACKS Seminar: Dragan Huterer
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ACKS Seminar: Jason Glenn (Colorado)
| What | seminar ACKS |
|---|---|
| When |
12 October 06 from 04:00 pm to 05:00 pm |
| Where | SLAC FKB Auditorium |
| Contact Name | Sarah Church |
| Contact Email | schurch@stanford.edu |
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Probing the Growth of Massive Galaxies at High Redshifts with Sub/millimeter Observations
FIRAS observations with COBE yielded the surprising result that the cosmic far-infrared background radiation (CFIRB; distinct from the cosmic microwave background radiation) has comparable power to the integrated optical and ultraviolet starlight in the Universe. The far-infrared radiation arose from reprocessing by dust of ultraviolet radiation from young stars and super-massive black hole growth in the assembly of galaxies. Given the brightness of the CFIRB, characterizing this galaxy population is clearly necessary for a complete census of galaxy formation. Recent sub/millimeter surveys have detected galaxies with redshifts z > 1, extreme luminosities of > 10^13 solar luminosities, star formation rates as large as 10^3 solar masses per year, and large reservoirs of molecular gas. These "protogalaxies" are likely progenitors of modern-day elliptical galaxies and massive bulges in spiral galaxies. I will describe galaxy surveys using our millimeter-wave bolometer array camera, Bolocam, and Z-Spec, a broadband, millimeter-wave spectrometer for measuring redshifts using CO rotational-ladder spectra. Our Bolocam survey places the tightest constraints on the galaxy number counts as a function of brightness to date. Z-Spec brings together short-wavelength and millimeter-wave technologies by combining a waveguide-coupled diffraction grating with a bolometer array. I will discuss ideas for this and related science with the proposed 25-m Cornell Caltech Atacama Telescope, in which the University of Colorado is a potential partner.
KIPAC tea talk, Speaker: Gary Godfrey