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The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release
- Source :
- Astronomy and Astrophysics, Volume 602, Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2017, 602, ⟨10.1051/0004-6361/201628704⟩, Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 602, ⟨10.1051/0004-6361/201628704⟩, Astronomy & astrophysics, 602:A1. EDP Sciences
- Publication Year :
- 2017
-
Abstract
- We present the VLA-COSMOS 3 GHz Large Project based on 384 hours of observations with the Karl G. Jansky Very Large Array (VLA) at 3 GHz (10 cm) toward the two square degree Cosmic Evolution Survey (COSMOS) field. The final mosaic reaches a median rms of 2.3 uJy/beam over the two square degrees at an angular resolution of 0.75". To fully account for the spectral shape and resolution variations across the broad (2 GHz) band, we image all data with a multiscale, multifrequency synthesis algorithm. We present a catalog of 10,830 radio sources down to 5 sigma, out of which 67 are combined from multiple components. Comparing the positions of our 3 GHz sources with those from the Very Long Baseline Array (VLBA)-COSMOS survey, we estimate that the astrometry is accurate to 0.01" at the bright end (signal-to-noise ratio, S/N_3GHz > 20). Survival analysis on our data combined with the VLA-COSMOS 1.4~GHz Joint Project catalog yields an expected median radio spectral index of alpha=-0.7. We compute completeness corrections via Monte Carlo simulations to derive the corrected 3 GHz source counts. Our counts are in agreement with previously derived 3 GHz counts based on single-pointing (0.087 square degrees) VLA data. In summary, the VLA-COSMOS 3 GHz Large Project simultaneously provides the largest and deepest radio continuum survey at high (0.75") angular resolution to date, bridging the gap between last-generation and next-generation surveys.<br />19 pages, 18 figures, 5 tables, accepted for publication in A&A
- Subjects :
- ACTIVE GALACTIC NUCLEI
Spectral shape analysis
PRIRODNE ZNANOSTI. Fizika. Astronomija i astrofizika
Monte Carlo method
AZTEC MILLIMETER SURVEY
FOS: Physical sciences
Astrophysics
01 natural sciences
Jansky
0103 physical sciences
LARGE-SCALE STRUCTURE
RADIO SPECTRAL INDEX
NATURAL SCIENCES. Physics. Astronomy and Astrophysics
atalogs
cosmology: observations
radio continuum: galaxies
Source counts
010303 astronomy & astrophysics
Very Long Baseline Array
QB
Physics
LEGACY SURVEY
Spectral index
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
010308 nuclear & particles physics
20 CM
POINT-SOURCE CATALOG
PHOENIX DEEP SURVEY
Astronomy and Astrophysics
Astrometry
STAR-FORMATION HISTORY
Astrophysics - Astrophysics of Galaxies
observations [cosmology]
galaxies [radio continuum]
Square degree
SOURCE POPULATION
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
catalogs
Subjects
Details
- ISSN :
- 14320746 and 00046361
- Volume :
- 602
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics
- Accession number :
- edsair.doi.dedup.....2b6e57e1fa8e70ea47676129249b1734