Evidence for a Population of High-Redshift Submillimeter Galaxies from Interferometric Imaging - AstrophysicsReport as inadecuate




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Abstract: We have used the Submillimeter Array to image a flux limited sample of sevensubmillimeter galaxies, selected by the AzTEC camera on the JCMT at 1.1 mm, inthe COSMOS field at 890um with 2- resolution. All of the sources - tworadio-bright and five radio-dim - are detected as single point-sources at highsignificance > 6\sigma, with positions accurate to 0.2- that enablecounterpart identification at other wavelengths observed with similarly highangular resolution. All seven have IRAC counterparts, but only two have securecounterparts in deep HST-ACS imaging. As compared to the two radio-brightsources in the sample, and those in previous studies, the five radio-dimsources in the sample 1 have systematically higher submillimeter-to-radioflux ratios, 2 have lower IRAC 3.6-8.0um fluxes, and 3 are not detected at24um. These properties, combined with size constraints at 890um \theta <1.2-, suggest that the radio-dim submillimeter galaxies represent a populationof very dusty starbursts, with physical scales similar to local ultraluminousinfrared galaxies, and an average redshift higher than radio-bright sources.



Author: Joshua D. Younger, Giovanni G. Fazio, Jia-Sheng Huang, Min S. Yun, Grant W. Wilson, Matthew L. N. Ashby, Mark A. Gurwell, Kamson

Source: https://arxiv.org/







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