IDENTIFICATION OF TWO BRIGHT z > 3 SUBMILLIMETER GALAXY CANDIDATES IN THE COSMOS FIELD

Journal Article · Tue Aug 10 00:00:00 EDT 2010 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/719/1/L15· OSTI ID:21450976

Aravena, M ^[1]; Younger, J D ^[2]; Fazio, G G; Gurwell, M; Espada, D; Wilner, D ^[3]; Bertoldi, F ^[4]; Capak, P ^[5]

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1. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
2. Institute for Advanced Study, Einstein Drive, Princeton, NJ 08544 (United States)
3. Harvard Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)
4. Argelander Institut fuer Astronomie, Auf dem Huegel 71, 53121 Bonn (Germany)
5. California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)

We present high-resolution interferometric Submillimeter Array imaging at 890 {mu}m ({approx}2'' resolution) of two millimeter selected galaxies-MMJ100015+021549 and MMJ100047+021021-discovered with the Max-Planck Millimeter Bolometer (MAMBO) on the IRAM 30 m telescope and also detected with Bolocam on the CSO, in the COSMOS field. The first source is significantly detected at the {approx}11{sigma} level, while the second source is tentatively detected at the {approx}4{sigma} level, leading to a positional accuracy of {approx}0.''2-0.''3. MM100015+021549 is identified with a faint radio and K-band source. MMJ100047+021021 shows no radio emission and is tentatively identified with a very faint K-band peak which lies at {approx}1.''2 from a clumpy optical source. The submillimeter-to-radio flux ratio for MM100015+021549 yields a redshift of {approx}4.8, consistent with the redshift implied by the UV-to-submillimeter photometry, z {approx} 3.0-5.0. We find evidence for warm dust in this source with an infrared luminosity in the range {approx}(0.9-2.5) x 10{sup 13} L{sub sun}, supporting the increasing evidence for a population of luminous submillimeter galaxies at z > 3. Finally, the lack of photometric data for MMJ100047+021021 does not allow us to investigate its properties in detail; however, its submillimeter-to-radio flux ratio implies z > 3.5.

• OSTI ID: 21450976
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 719; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BOLOMETERS
EVOLUTION
GALACTIC EVOLUTION
GALAXIES
LUMINOSITY
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
RED SHIFT
TELESCOPES
UNIVERSE