An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution

Brisbin, Drew and Miettinen, Oskari and Aravena, Manuel and Smolčić, Vernesa and Delvecchio, Ivan and Jiang, Chunyan and Magnelli, Benjamin and Albrecht, Marcus and Munoz Arancibia, Alejandra and Aussel, Herve and Baran, Nikola and Bertoldi, Frank and Bethermin, Matthieu and Capak, Peter and Casey, Caitlin M. and Civano, Francesca and Hayward, Christopher C. and Ilbert, Olivier and Karim, Alexander and Le Fevre, Olivier and Marchesi, Stefano and McCracken, Henry Joy and Navarrete, Felipe and Novak, Mladen and Riechers, Dominik and Padilla, Nelson and Salvato, Mara and Scott, Kimberly and Schinnerer, Eva and Sheth, Kartik and Tasca, Lidia (2017) An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution. Astronomy and Astrophysics, 608. Art.No.15. ISSN 0004-6361

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We carried out targeted ALMA observations of 129 fields in the COSMOS region at 1.25 mm, detecting 152 galaxies at S/N ≥ 5 with an average continuum RMS of 150 μJy. These fields represent a S/N-limited sample of AzTEC/ASTE sources with 1.1 mm S/N ≥ 4 over an area of 0.72 square degrees. Given ALMA’s fine resolution and the exceptional spectroscopic and multiwavelength photometric data available in COSMOS, this survey allows us unprecedented power in identifying submillimeter galaxy counterparts and determining their redshifts through spectroscopic or photometric means. In addition to 30 sources with prior spectroscopic redshifts, we identified redshifts for 113 galaxies through photometric methods and an additional nine sources with lower limits, which allowed a statistically robust determination of the redshift distribution. We have resolved 33 AzTEC sources into multi-component systems and our redshifts suggest that nine are likely to be physically associated. Our overall redshift distribution peaks at z ~ 2.0 with a high-redshift tail skewing the median redshift to .48 ± 0.05. We find that brighter millimeter sources are preferentially found at higher redshifts. Our faintestsources, with S1.25 mm < 1.25 mJy, have a median redshift of .18 ± 0.09, while the brightest sources, S1.25 mm > 1.8 mJy, have a median redshift of .08 ± 0.17. After accounting for spectral energy distribution shape and selection effects, these results are consistent with several previous submillimeter galaxy surveys, and moreover, support the conclusion that the submillimeter galaxy redshift distribution is sensitive to survey depth.

Item Type: Article
Keywords: galaxies: distances and redshifts, galaxies: evolution, galaxies: statistics, galaxies: high-redshift, catalogs
Date: 2017
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © ESO, 2017. Received: 3 February 2017. Accepted: 21 August 2017. Published online 29 November 2017.
Divisions: Faculty of Science > Department of Physics
Publisher: EDP Sciences
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 11 Mar 2018 16:22
Last Modified: 11 Mar 2018 16:25

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