Smolčić, V. and Navarrete, F. and Aravena, M. and Ilbert, O. and Yun, M. S. and Sheth, K. and Salvato, M. and McCracken, H. J. and Diener, C. and Aretxaga, I. and Riechers, D. A. and Finoguenov, A. and Bertoldi, F. and Capak, P. and Hughes, D. and Karim, A. and Schinnerer, E. and Scoville, N. Z. and Wilson, G. (2012) Quest for COSMOS Submillimeter Galaxy Counterparts using CARMA and VLA: Identifying Three High-redshift Starburst Galaxies. Astrophysical Journal Supplement Series, 200 (1). p. 10. ISSN 0067-0049 http://resolver.caltech.edu/CaltechAUTHORS:20120606-132340653
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We report on interferometric observations at 1.3 mm at 2"-3" resolution using the Combined Array for Research in Millimeter-wave Astronomy. We identify multi-wavelength counterparts of three submillimeter galaxies (SMGs; F_(1mm) > 5.5 mJy) in the COSMOS field, initially detected with MAMBO and AzTEC bolometers at low, ~10"-30", resolution. All three sources—AzTEC/C1, Cosbo-3, and Cosbo-8—are identified to coincide with positions of 20 cm radio sources. Cosbo-3, however, is not associated with the most likely radio counterpart, closest to the MAMBO source position, but with that farther away from it. This illustrates the need for intermediate-resolution (~2") mm-observations to identify the correct counterparts of single-dish-detected SMGs. All of our three sources become prominent only at NIR wavelengths, and their mm-to-radio flux based redshifts suggest that they lie at redshifts z ≳ 2. As a proof of concept, we show that photometric redshifts can be well determined for SMGs, and we find photometric redshifts of 5.6 ± 1.2, 1.9^(+0.9)_(–0.5), and ~4 for AzTEC/C1, Cosbo-3, and Cosbo-8, respectively. Using these we infer that these galaxies have radio-based star formation rates of ≳ 1000 M_☉ yr^(–1) and IR luminosities of ~10^(13) L_☉ consistent with properties of high-redshift SMGs. In summary, our sources reflect a variety of SMG properties in terms of redshift and clustering, consistent with the framework that SMGs are progenitors of z ~ 2 and today's passive galaxies.
|Additional Information:||© 2012 American Astronomical Society. Received 2011 May 10; accepted 2012 March 21; published 2012 May 4. The authors thank the anonymous referee for comments that significantly improved the manuscript. The research leading to these results has received funding from the European Union’s Seventh Framework programme under grant agreement 229517. M.S. acknowledges support by the German Deutsche Forschungsgemeinschaft, DFG Leibniz Prize (FKZ HA 1850/28-1). A.K. acknowledges support by the DFG grant SCHI 536/3-3 as part of the Priority Programme 1177 (Witnesses of Cosmic History: Formation and Evolution of Black Holes, Galaxies and their Environment). Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement, and by the CARMA partner universities.|
|Subject Keywords:||galaxies: active; galaxies: distances and redshifts; galaxies: high-redshift; galaxies: starburst; submillimeter: galaxies|
|Official Citation:||Quest for COSMOS Submillimeter Galaxy Counterparts using CARMA and VLA: Identifying Three High-redshift Starburst Galaxies V. Smolčić et al. 2012 ApJS 200 10|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||07 Jun 2012 15:08|
|Last Modified:||26 Dec 2012 15:18|
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