THE AzTEC/SMA INTERFEROMETRIC IMAGING SURVEY OF SUBMILLIMETER-SELECTED HIGH-REDSHIFT GALAXIES

Journal Article · Sat Oct 10 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/704/1/803· OSTI ID:21367385

Younger, Joshua D; Fazio, Giovanni G; Jiasheng, Huang; Ashby, Matthew L. N.; Gurwell, Mark A; Petitpas, Glen R; Wilner, David J ^[1]; Yun, Min S; Wilson, Grant W; Scott, Kimberly S; Austermann, Jason; Perera, Thushara ^[2]; Peck, Alison B ^[3]; Hughes, David H; Aretxaga, Itziar ^[4]; Kim, Sungeun ^[5]

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
2. Astronomy Department, University of Massachusetts, Amherst, MA 01003 (United States)
3. Joint ALMA Office, El Golf 40, Las Condes, Santiago 7550108 (Chile)
4. Instituto Nacional de AstrofIsica, Optica y Electronica (INAOE), Tonantzintla, Peubla (Mexico)
5. Astronomy and Space Sciences Department, Sejong University, 98 Kwangjin-gu, Kunja-dong, Seoul 143-747 (Korea, Republic of)

We present results from a continuing interferometric survey of high-redshift submillimeter galaxies (SMGs) with the Submillimeter Array, including high-resolution (beam size approx2 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.

• OSTI ID: 21367385
• Journal Information: Astrophysical Journal, Vol. 704, Issue 1; Other Information: DOI: 10.1088/0004-637X/704/1/803; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGY
DUSTS
GALACTIC EVOLUTION
GALAXIES
MORPHOLOGY
RED SHIFT
SIGNAL-TO-NOISE RATIO
UNIVERSE
DIMENSIONLESS NUMBERS
EVOLUTION