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The AGN content of deep radio surveys and radio emission in radio-quiet AGN. Why every astronomer should care about deep radio fields

Published online by Cambridge University Press:  25 July 2014

P. Padovani ,
M. Bonzini ,
N. Miller ,
K. I. Kellermann ,
V. Mainieri ,
P. Rosati ,
P. Tozzi  and
S. Vattakunnel
P. Padovani
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany email: ppadovan@eso.org
M. Bonzini
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany email: ppadovan@eso.org
N. Miller
Affiliation:
Department of Mathematics and Physical Sciences, Stevenson University, 1525 Greenspring Valley Road, Stevenson, MD 21153-0641, USA
K. I. Kellermann
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA
V. Mainieri
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany email: ppadovan@eso.org
P. Rosati
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany email: ppadovan@eso.org Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, I-44122, Ferrara, Italy (current address)
P. Tozzi
Affiliation:
INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi, I-50125, Firenze, Italy
S. Vattakunnel
Affiliation:
INAF, Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, I-34131, Trieste, Italy
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Abstract

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We present our very recent results on the sub-mJy radio source populations at 1.4 GHz based on the Extended Chandra Deep Field South VLA survey, which reaches ~ 30 μJy, with details on their number counts, evolution, and luminosity functions. The sub-mJy radio sky turns out to be a complex mix of star-forming galaxies and radio-quiet AGN evolving at a similar, strong rate and declining radio-loud AGN. 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-mJy sky. Our results shed also light on a fifty-year-old issue, namely radio emission from radio-quiet AGN, and suggest that it is closely related to star formation, at least at z ~ 1.5 − 2. The implications of our findings for future, deeper radio surveys, including those with the Square Kilometre Array, are also discussed. One of the main messages, especially to non-radio astronomers, is that radio surveys are reaching such faint limits that, while previously they were mainly useful for radio quasars and radio galaxies, they are now detecting mostly star-forming galaxies and radio-quiet AGN, i.e., the bulk of the extragalactic sources studied in the infrared, optical, and X-ray bands.

Keywords

galaxies: active — galaxies: starburst — radio continuum: galaxies — infrared radiation: galaxies — X-rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 79 - 85
Copyright
Copyright © International Astronomical Union 2014 

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