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

Smolčić, V. and Mooley, K. P. and Bourke, S and Baloković, M. and Hallinan, G. and Kulkarni, S. R. and Scoville, N. Z. and Capak, P. (2017) The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release. Astronomy and Astrophysics, 602 . Art. No. A1. ISSN 0004-6361. doi:10.1051/0004-6361/201628704.

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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 0.75″. 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 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 0.01″ at the bright end (signal-to-noise ratio, S/N_(3 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 (0.75″) angular resolution to date, bridging the gap between last-generation and next-generation surveys.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Smolčić, V.0000-0002-3893-8614
Mooley, K. P.0000-0002-2557-5180
Baloković, M.0000-0003-0476-6647
Hallinan, G.0000-0002-7083-4049
Kulkarni, S. R.0000-0001-5390-8563
Scoville, N. Z.0000-0002-0438-3323
Capak, P.0000-0003-3578-6843
Additional Information:© 2017 ESO. Article published by EDP Sciences. Received 13 April 2016; Accepted 20 June 2017; Published online 13 June 2017. We thank the referee, Jim Condon, for insightful comments that helped improve the manuscript. Based on observations with the National Radio Astronomy Observatory which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research was funded by the European Union’s Seventh Frame-work 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.
Group:COSMOS, Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
European Research Council (ERC)333654
European Research Council (ERC)337595
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)956
Deutsche Forschungsgemeinschaft (DFG)1573
Subject Keywords:catalogs – cosmology: observations – radio continuum: galaxies
Record Number:CaltechAUTHORS:20170928-101836348
Persistent URL:
Official Citation:The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release V. Smolčić, M. Novak, M. Bondi, P. Ciliegi, K. P. Mooley, E. Schinnerer, G. Zamorani, F. Navarrete, S. Bourke, A. Karim, E. Vardoulaki, S. Leslie, J. Delhaize, C. L. Carilli, S. T. Myers, N. Baran, I. Delvecchio, O. Miettinen, J. Banfield, M. Baloković, F. Bertoldi, P. Capak, D. A. Frail, G. Hallinan, H. Hao, N. Herrera Ruiz, A. Horesh, O. Ilbert, H. Intema, V. Jelić, H.-R. Klöckner, J. Krpan, S. R. Kulkarni, H. McCracken, C. Laigle, E. Middleberg, E. J. Murphy, M. Sargent, N. Z. Scoville and K. Sheth A&A, 602 (2017) A1 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81894
Deposited By: Tony Diaz
Deposited On:28 Sep 2017 17:27
Last Modified:15 Nov 2021 19:46

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