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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358526.0, MPI für Astronomie / Publikationen_mpia
Evidence for a population of high-redshift submillimeter galaxies from interferometric imaging
Authors:Younger, J. D.; Fazio, G. G.; Huang, J.-S.; Yun, M. S.; Wilson, G. W.; Ashby, M. L. N.; Gurwell, M. A.; Lai, K.; Peck, A. B.; Petitpas, G. R.; Wilner, D. J.; Iono, D.; Kohno, K.; Kawabe, R.; Hughes, D. H.; Aretxaga, I.; Webb, T.; Martínez-Sansigre, A.; Kim, S.; Scott, K. S.; Austermann, J.; Perera, T.; Lowenthal, J. D.; Schinnerer, E.; Smolcic, V.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Start Page:1531
End Page:1537
Audience:Not Specified
Abstract / Description:We have used the Submillimeter Array to image a flux-limited sample of seven submillimeter galaxies, selected by the AzTEC camera on the JCMT at 1.1 mm, in the COSMOS field at 890 mum with ~2" resolution. All of the sources-two radio-bright and five radio-dim-are detected as single point sources at high significance (>6 sigma), with positions accurate to ~0.2" that enable counterpart identification at other wavelengths observed with similarly high angular resolution. All seven have IRAC counterparts, but only two have secure counterparts in deep HST ACS imaging. As compared to the two radio-bright sources in the sample, and those in previous studies, the five radio-dim sources in the sample (1) have systematically higher submillimeter-to-radio flux ratios, (2) have lower IRAC 3.6-8.0 mum fluxes, and (3) are not detected at 24 mum. These properties, combined with size constraints at 890 mum (theta<~1.2''), suggest that the radio-dim submillimeter galaxies represent a population of very dusty starbursts, with physical scales similar to local ultraluminous infrared galaxies, with an average redshift higher than radio-bright sources.
Free Keywords:Cosmology: Observations; Galaxies: Evolution; Galaxies: Formation; Galaxies: High-Redshift; Galaxies: Starburst; Submillimeter
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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