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ALMA Observations of SPT-discovered, Strongly Lensed, Dusty, Star-forming Galaxies

Hezaveh, Y. D. and Vieira, J. D. and Lueker, M. and Padin, S. and Shirokoff, E. and Staniszewski, Z. (2013) ALMA Observations of SPT-discovered, Strongly Lensed, Dusty, Star-forming Galaxies. Astrophysical Journal, 767 (2). Art. No. 132. ISSN 0004-637X.

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We present Atacama Large Millimeter/submillimeter Array (ALMA) 860 μm 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 × 10^(13) L_☉ and star formation surface density of 4200 M_☉ yr^(–1) kpc^(–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 × 10^(11) M_☉. 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.

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Additional Information:© 2013 American Astronomical Society. Received 2012 September 18; accepted 2013 March 1; published 2013 April 4. The SPT is supported by the National Science Foundation through grant ANT-0638937, with partial support through PHY-1125897, the Kavli Foundation, and the Gordon and Betty Moore Foundation. This paper makes use of the following ALMA data: ADS/JAO.ALMA #2011.0.00957.S and #2011.0.00958.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Partial support for this work was provided by NASA through grant HST-GO-12659 from the Space Telescope Science Institute and an award for Herschel analysis issued by JPL/Caltech for OT2_jvieira_5. Work at McGill is supported by NSERC, the CRC program, and CIfAR. Y.D.H. acknowledges the support of FQRNT through International Training Program and Doctoral Research scholarships. T.R.G. acknowledges support from the Science and Technologies Facilities Council.
Funding AgencyGrant Number
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
NASA Space Telescope Science InstituteHST-GO-12659
FQRNT International Training ProgramUNSPECIFIED
FQRNT Doctoral Research scholarshipsUNSPECIFIED
Science and Technologies Facilities Council (STFC)UNSPECIFIED
Subject Keywords:galaxies: high-redshift; galaxies: starburst; gravitational lensing: strong; techniques: interferometric
Issue or Number:2
Record Number:CaltechAUTHORS:20130521-144624396
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Official Citation:ALMA Observations of SPT-discovered, Strongly Lensed, Dusty, Star-forming Galaxies Y. D. Hezaveh, D. P. Marrone, C. D. Fassnacht, J. S. Spilker, J. D. Vieira, J. E. Aguirre, K. A. Aird, M. Aravena, M. L. N. Ashby, M. Bayliss, B. A. Benson, L. E. Bleem, M. Bothwell, M. Brodwin, J. E. Carlstrom, C. L. Chang, S. C. Chapman, T. M. Crawford, A. T. Crites, C. De Breuck, T. de Haan, M. A. Dobbs, E. B. Fomalont, E. M. George, M. D. Gladders, A. H. Gonzalez, T. R. Greve, N. W. Halverson, F. W. High, G. P. Holder, W. L. Holzapfel, S. Hoover, J. D. Hrubes, K. Husband, T. R. Hunter, R. Keisler, A. T. Lee, E. M. Leitch, M. Lueker, D. Luong-Van, M. Malkan, V. McIntyre, J. J. McMahon, J. Mehl, K. M. Menten, S. S. Meyer, L. M. Mocanu, E. J. Murphy, T. Natoli, S. Padin, T. Plagge, C. L. Reichardt, A. Rest, J. Ruel, J. E. Ruhl, K. Sharon, K. K. Schaffer, L. Shaw, E. Shirokoff, B. Stalder, Z. Staniszewski, A. A. Stark, K. Story, K. Vanderlinde, A. Weiß, N. Welikala, and R. Williamson doi:10.1088/0004-637X/767/2/132
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38617
Deposited By: Ruth Sustaita
Deposited On:21 May 2013 22:26
Last Modified:03 Oct 2019 04:59

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