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An ALMA survey of submillimeter galaxies in the COSMOS field: Multiwavelength counterparts and redshift distribution
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 608, ⟨10.1051/0004-6361/201730558⟩, Astronomy and Astrophysics, Volume 608, Astronomy and Astrophysics-A&A, 2017, 608, ⟨10.1051/0004-6361/201730558⟩
- Publication Year :
- 2017
- Publisher :
- HAL CCSD, 2017.
-
Abstract
- We carried out targeted ALMA observations of 129 fields in the COSMOS region at 1.25 mm, detecting 152 galaxies at S/N$\geq$5 with an average continuum RMS of 150 $��$Jy. These fields represent a S/N-limited sample of AzTEC / ASTE sources with 1.1 mm S/N$\geq$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\sim$2.0 with a high redshift tail skewing the median redshift to $\tilde{z}$=2.48$\pm$0.05. We find that brighter millimeter sources are preferentially found at higher redshifts. Our faintest sources, with S$_{1.25 \rm mm}$1.8 mJy, have a median redshift of $\tilde{z}$=3.08$\pm$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.<br />Accepted for publication in Astronomy & Astrophysics for review 17 pages in body + 26 in appendices
- Subjects :
- statistics [galaxies]
PRIRODNE ZNANOSTI. Fizika. Astronomija i astrofizika
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
01 natural sciences
galaxies: distances and redshifts, galaxies: evolution, galaxies: statistics, galaxies: high-redshift, catalogs
0103 physical sciences
Fine resolution
NATURAL SCIENCES. Physics. Astronomy and Astrophysics
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
evolution [galaxies]
Physics
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
010308 nuclear & particles physics
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
Redshift
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Spectral energy distribution
distances and redshifts [galaxies]
Millimeter
Astrophysics::Earth and Planetary Astrophysics
high-redshift [galaxies]
catalogs
Subjects
Details
- Language :
- English
- ISSN :
- 00046361 and 14320746
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 608, ⟨10.1051/0004-6361/201730558⟩, Astronomy and Astrophysics, Volume 608, Astronomy and Astrophysics-A&A, 2017, 608, ⟨10.1051/0004-6361/201730558⟩
- Accession number :
- edsair.doi.dedup.....eeb77db31a6154a4a802caaa3b1a086b