The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release

Smolčić, Vernesa and Novak, Mario and Bondi, M. and Ciliegi, P. and Mooley, K. P. and Schinnerer, E. and Zamorani, G. and Navarrete, F. and Bourke, S. and Karim, A. and Vardoulaki, E. and Leslie, S. and Delhaize, J. and Carilli, C. L. and Myers, S. T. and Baran, N. and Delvecchio, I. and Miettinen, O. and Banfield, J. and Baloković, M. and Bertoldi, F. and Capak, P. and Frail, D. A. and Hallinan, G. and Hao, H. and Herrera Ruiz, N. and Horesh, A. and Ilbert, O. and Intema, H. and Jelić, Vibor and Klöckner, H-R. and Krpan, J. and Kulkarni, S. R. and McCracken, H. and Laigle, C. and Middleberg, E. and Murphy, E. J. and Sargent, M. and Scoville, N. Z. and Sheth, K. (2017) The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release. Astronomy and Astrophysics, 602. Art. No. A1-19. ISSN 0004-6361

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We present the VLA-COSMOS 3 GHz Large Project based on 384 h 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 µJy beam−1 over the two square degrees at an angular resolution of 0.7500. 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 5σ, 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 0.0100at the bright end (signal-to-noise ratio, S/N3 GHz > 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 α = −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 (0.7500) angular resolution to date, bridging the gap between last-generation and next-generation surveys.

Item Type: Article
Keywords: catalogs – cosmology, observations – radio continuum, galaxies
Date: June 2017
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2017 ESO. Received 13 April 2016. This research was funded by the European Union’s Seventh Framework programs under grant agreements 333654 (CIG, “AGN feedback”) and 337595 (ERC Starting Grant, “CoSMass”). M.B. and P.C. acknowlege support from the PRIN-INAF 2014. A.K. and F.B. acknowledge support by the Collaborative Research Council 956, sub-project A1, funded by the Deutsche Forschungsgemeinschaft (DFG). B.M. and F.B. acknowledge support through DFG priority program 1573 founded by the DFG. Accepted 20 June 2016. Published online 13 June 2017.
Divisions: Faculty of Science > Department of Physics
Publisher: EDP Sciences
Depositing User: Vernesa Smolčić
Date Deposited: 06 Nov 2017 14:25
Last Modified: 08 Nov 2017 11:05

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