Journal
ASTROPHYSICAL JOURNAL
Volume 704, Issue 1, Pages 803-812Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/704/1/803
Keywords
cosmology: observations; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: starburst; submillimeter
Categories
Funding
- Smithsonian Institution
- Academia Sinica
- NASA [1407, HF-51266.01, NAS 5-26555]
- NSF [0540852]
- Korea Science and Engineering Foundation (KOSEF)
- CONACyT
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0540852] Funding Source: National Science Foundation
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We present results from a continuing interferometric survey of high-redshift submillimeter galaxies (SMGs) with the Submillimeter Array, including high-resolution (beam size similar to 2 arcsec) imaging of eight additional AzTEC 1.1 mm selected sources in the COSMOS field, for which we obtain six reliable (peak signal-to-noise ratio (S/N) > 5 or peak S/N > 4 with multiwavelength counterparts within the beam) and two moderate significance (peak S/N > 4) detections. When combined with previous detections, this yields an unbiased sample of millimeter-selected SMGs with complete interferometric follow up. With this sample in hand, we (1) empirically confirm the radio-submillimeter association, (2) examine the submillimeter morphology-including the nature of SMGs with multiple radio counterparts and constraints on the physical scale of the far infrared-of the sample, and (3) find additional evidence for a population of extremely luminous, radio-dim SMGs that peaks at higher redshift than previous, radio-selected samples. In particular, the presence of such a population of high-redshift sources has important consequences for models of galaxy formation-which struggle to account for such objects even under liberal assumptions-and dust production models given the limited time since the big bang.
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