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

Smolčić, Vernesa; Novak, M.; Bondi, M.; Ciliegi, P.; Mooley, K. P.; Schinnerer, E.; Zamorani, G.; Navarrete, F.; Bourke, S.; Karim, A.; Vardoulaki, E.; Leslie, S.; Delhaize, J.; Carilli, C. L.; Myers, S. T.; Baran, N.; Delvecchio, I.; Miettinen, O.; Banfield, J.; Baloković, M.; Bertoldi, F.; Capak, P.; Frail, D. A.; Hallinan, G.; Hao, H.; Herrera Ruiz, N.; Horesh, A.; Ilbert, O.; Intema, H.; Jelić, Vibor; Klöckner, H.-R.; Krpan, J.; Kulkarni, S. R.; McCracken, H.; Laigle, C.; Middleberg, E.; Murphy, E. J.; Sargent, M.; Scoville, N. Z.; Sheth, K. (2017) The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release. Astronomy and Astrophysics, 602 . A1-1-A1-19. ISSN 0004-6361

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Abstract

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/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 (0.75″) angular resolution to date, bridging the gap between last-generation and next- generation surveys.

Item Type:	Article
Uncontrolled Keywords:	atalogs; cosmology: observations; radio continuum: galaxies
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Constraining AGN feedback through cosmic times: Paving the way for the next generation radio facilities-AGN FEEDBACK UNSPECIFIED 333654 EK Constraining Stellar Mass and Supermassive Black Hole Growth through Cosmic Times: Paving the way for the next generation sky surveys-COSMASS UNSPECIFIED 337595 EK
Depositing User:	Vibor Jelić
Date Deposited:	23 Aug 2017 15:07
URI:	http://fulir.irb.hr/id/eprint/3537
DOI:	10.1051/0004-6361/201628704

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