GBT Zpectrometer CO(1-0) Observations of the Herschel-ATLAS Strongly Lensed Sub-mm Galaxies

Details GBT Zpectrometer CO(1-0) Observations of the Herschel-ATLAS Strongly Lensed Sub-mm Galaxies GBT Zpectrometer CO(1-0) Observations of the Herschel-ATLAS Strongly Lensed Sub-mm Galaxies

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720209f&link_type=abstract

American Astronomical Society, AAS Meeting #217, #202.09; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) has uncovered a population of strongly-lensed submillimeter galaxies (SMGs). We report on our ongoing Zpectrometer observations on the Green Bank Telescope (GBT) to measure the redshifts and constrain the masses of the cold molecular gas reservoirs for this sample of SMGs at z 2--3.5. We find typical L(IR)/L'(CO) ratios of 100--150 Lsun (K km/s pc2)-1, which are consistent with those found for local ULIRGs and other high-redshift SMGs. We find no evidence for enhanced L(IR)/L'(CO(1-0)) ratios for the SMG population in comparison to local ULIRGs, in contrast to previous claims based on the higher-J CO transitions. The GBT/Zpectrometer results highlight the power of using the CO lines to derive blind redshifts, which is challenging for the SMG population at optical wavelengths given their high obscuration. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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