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

Scientific paper - Original scientific paper

• Author: Drew Brisbin
• Author: Oskari Miettinen
• Author: Manuel Aravena
• Author: Vernesa Smolčić; MBZ: 336180
• Author: Ivan Delvecchio
• Author: Chunyan Jiang
• Author: Benjamin Magnelli
• Author: Marcus Albrecht
• Author: Alejandra Muñoz Arancibia
• Author: Hervé Aussel
• Author: Nikola Baran
• Author: Frank Bertoldi
• Author: Matthieu Béthermin
• Author: Peter Capak
• Author: Caitlin M. Casey
• Author: Francesca Civano
• Author: Christopher C. Hayward
• Author: Olivier Ilbert
• Author: Alexander Karim
• Author: Olivier Le Fevre
• Author: Stefano Marchesi
• Author: Henry Joy McCracken
• Author: Felipe Navarrete
• Author: Mladen Novak; MBZ: 344074
• Author: Dominik Riechers
• Author: Nelson Padilla
• Author: Mara Salvato
• Author: Kimberly Scott
• Author: Eva Schinnerer
• Author: Kartik Sheth
• Author: Lidia Tasca
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics; Astronomy and Astrophysics

Abstract (english)

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... More 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. Less

• Keywords (english): galaxies: distances and redshifts; galaxies: evolution; galaxies: statistics; galaxies: high-redshift; catalogs
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Astronomy and Astrophysics
• Numbering: vol. 608, 15
• p-ISSN: 0004-6361
• e-ISSN: 1432-0746
• DOI: https://doi.org/10.1051/0004-6361/201730558
• URN:NBN: urn:nbn:hr:217:253102
• Publication: 2017
• Document URL: https://www.aanda.org/articles/aa/abs/2017/12/aa30558-17/aa30558-17.html
• Type of resource: Text
• Access conditions: Open access
• Public note: © ESO, 2017. Received: 3 February 2017. Accepted: 21 August 2017. Published online 29 November 2017.
• Created on: 2020-02-27 20:10:18