ALMA OBSERVATIONS OF SPT-DISCOVERED, STRONGLY LENSED, DUSTY, STAR-FORMING GALAXIES

Journal Article · Sat Apr 20 00:00:00 EDT 2013 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/767/2/132· OSTI ID:22126922

Hezaveh, Y. D. ^[1]; Marrone, D. P.; Spilker, J. S.; Bothwell, M. ^[2]; Fassnacht, C. D. ^[3]; Vieira, J. D. ^[4]; Aguirre, J. E. ^[5]; Aird, K. A. ^[6]; Aravena, M.; De Breuck, C. ^[7]; Ashby, M. L. N.; Bayliss, M. ^[8]; Benson, B. A.; Bleem, L. E.; Carlstrom, J. E.; Chang, C. L.; Crawford, T. M.; Crites, A. T. ^[9]; Brodwin, M. ^[10]; Chapman, S. C. ^[11] ; others, and

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1. Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec H3A 2T8 (Canada)
2. Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)
3. Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States)
4. California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States)
5. University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104 (United States)
6. University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
7. European Southern Observatory, Karl-Schwarzschild Strasse, D-85748 Garching bei Muenchen (Germany)
8. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
9. Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637 (United States)
10. Department of Physics and Astronomy, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110 (United States)
11. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 3J5 (Canada)

We present Atacama Large Millimeter/submillimeter Array (ALMA) 860 {mu}m imaging of four high-redshift (z = 2.8-5.7) dusty sources that were detected using the South Pole Telescope (SPT) at 1.4 mm and are not seen in existing radio to far-infrared catalogs. At 1.''5 resolution, the ALMA data reveal multiple images of each submillimeter source, separated by 1''-3'', consistent with strong lensing by intervening galaxies visible in near-IR imaging of these sources. We describe a gravitational lens modeling procedure that operates on the measured visibilities and incorporates self-calibration-like antenna phase corrections as part of the model optimization, which we use to interpret the source structure. Lens models indicate that SPT0346-52, located at z = 5.7, is one of the most luminous and intensely star-forming sources in the universe with a lensing corrected FIR luminosity of 3.7 Multiplication-Sign 10{sup 13} L{sub Sun} and star formation surface density of 4200 M{sub Sun} yr{sup -1} kpc{sup -2}. We find magnification factors of 5 to 22, with lens Einstein radii of 1.''1-2.''0 and Einstein enclosed masses of 1.6-7.2 Multiplication-Sign 10{sup 11} M{sub Sun }. These observations confirm the lensing origin of these objects, allow us to measure their intrinsic sizes and luminosities, and demonstrate the important role that ALMA will play in the interpretation of lensed submillimeter sources.

• OSTI ID: 22126922
• Journal Information: Astrophysical Journal, Vol. 767, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANTENNAS
CALIBRATION
CATALOGS
DENSITY
FIRS
GALAXIES
GRAVITATIONAL LENSES
LUMINOSITY
RED SHIFT
SIMULATION
STARS
SURFACES
VISIBILITY