VLA survey of the CDFS: the nature of faint radio sources

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dc.creatorTozzi, P.
dc.creatorKellermann, K.
dc.creatorFomalont, E.
dc.creatorMiller, N.
dc.creatorNorman, C.
dc.creatorMainieri, V.
dc.creatorPadovani, P.
dc.creatorRosati, P.
dc.creatorteam, the VLA-CDFS
dc.date2009-02-19
dc.date.accessioned2026-07-07T12:55:57Z
dc.date.available2026-07-07T12:55:57Z
dc.descriptionWe present the multiwavelength properties of 266 cataloged radio sources identified with 20 and 6 cm VLA deep observations of the CDFS at a flux density limit of 42 μJy at the field centre at 1.4 GHz. These new observations probe the faint end of both the star formation and radio galaxy/AGN population. X-ray data, including upper limits, turn out to be a key factor in establishing the nature of faint radio sources. We find that, while the well-known flattening of the radio number counts below 1 mJy is mostly due to star forming galaxies, these sources and AGN make up an approximately equal fraction of the sub--millijansky sky, contrary to some previous results. We have also uncovered a population of distant AGN systematically missing from many previous studies of sub-millijansky radio source identifications. The AGN include radio galaxies, mostly of the low-power, Fanaroff-Riley I type, and a significant radio-quiet component, which amounts to approximately one fifth of the total sample. We also find that radio detected, X-ray AGN are not more heavily obscured than the X-ray detected AGN. This argues against the use of radio surveys as an efficient way to search for the missing population of strongly absorbed AGN.
dc.description5 pages, 2 figures, to appear in the proceedings of "The Starburst-AGN Connection Conference", Shanghai, China, 27 Oct - 1 Nov 2008, ASP Conference Series
dc.identifierhttps://arxiv.org/abs/0902.3365
dc.identifierhttp://arxiv.org/abs/0902.3365
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224428
dc.subjectCosmology and Nongalactic Astrophysics
dc.subjectAstrophysics of Galaxies
dc.titleVLA survey of the CDFS: the nature of faint radio sources
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