1. The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release
- Author
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Shrinivas R. Kulkarni, Kunal Mooley, Julie Banfield, G. Zamorani, Mark Sargent, Frank Bertoldi, Sarah K. Leslie, Stephen Bourke, Eric J. Murphy, N. Baran, F. Navarrete, Eva Schinnerer, H. J. McCracken, Mladen Novak, Ivan Delvecchio, J. Delhaize, Alexander Karim, E. Middleberg, Vibor Jelić, Peter Capak, Gregg Hallinan, Dale A. Frail, Clotilde Laigle, Eleni Vardoulaki, Heng Hao, Mislav Baloković, Chris Carilli, H. R. Kloeckner, Nick Scoville, J. Krpan, Huib Intema, O. Ilbert, Kartik Sheth, Steven T. Myers, Paolo Ciliegi, M. Bondi, Vernesa Smolčić, Oskari Miettinen, Assaf Horesh, N. Herrera Ruiz, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), and Astronomy
- 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 - 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., 19 pages, 18 figures, 5 tables, accepted for publication in A&A
- Published
- 2017