Zpectrometer Blind Redshift Determinations for Distant Dusty Galaxies from the H-ATLAS Sample

Details Zpectrometer Blind Redshift Determinations for Distant Dusty Galaxies from the H-ATLAS Sample Zpectrometer Blind Redshift Determinations for Distant Dusty Galaxies from the H-ATLAS Sample

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944106b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #441.06

Astronomy and Astrophysics

Astronomy

Scientific paper

Far-infrared imaging of wide fields through the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) has revealed the existence of a population of very bright dusty galaxies, the majority of which are expected to be distant and gravitationally lensed. High obscuration in such systems can impede determination of their redshifts with optical spectroscopy. We are therefore pursuing these targets with radio-wavelength spectroscopy of CO rotational emission lines using the ultra-wide-bandwidth "Zpectrometer" on the 100m diameter Green Bank Telescope (GBT) of the National Radio Astronomy Observatory (NRAO). We have now obtained blind CO(1-0) redshifts of over a dozen objects from the H-ATLAS sample in the 2.1 < z < 3.5 interval, allowing us to determine a redshift distribution over this range independent of optical spectroscopy systematics. With CO redshifts, fluxes, and velocity widths in hand, we can make comparisons with the properties of classical submillimeter galaxies (SMGs), leading us to infer similar intrinsic properties but moderate lensing factors for the Herschel sources.

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