Journal
ASTROPHYSICAL JOURNAL
Volume 740, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/740/1/20
Keywords
galaxies: active; galaxies: starburst; infrared: galaxies; radio continuum: galaxies; X-rays: galaxies
Categories
Funding
- Chandra Award [AR8-9016X]
- National Science Foundation
- National Aeronautics and Space Administration
- NASA's Astrophysics Data System (ADS) Bibliographic Services
- [ASI-INAF I/009/10/0]
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We present the evolutionary properties and luminosity functions of the radio sources belonging to the Chandra Deep Field South Very Large Array survey, which reaches a flux density limit at 1.4 GHz of 43 mu Jy at the field center and redshift similar to 5 and which includes the first radio-selected complete sample of radio-quiet active galactic nuclei (AGNs). We use a new, comprehensive classification scheme based on radio, far-and near-IR, optical, and X-ray data to disentangle star-forming galaxies (SFGs) from AGNs and radio-quiet from radio-loud AGNs. We confirm our previous result that SFGs become dominant only below 0.1 mJy. The sub-millijansky radio sky turns out to be a complex mix of SFGs and radio-quiet AGNs evolving at a similar, strong rate; non-evolving low-luminosity radio galaxies; and declining radio powerful (P greater than or similar to 3 x 10(24) W Hz(-1)) AGNs. Our results suggest that radio emission from radio-quiet AGNs is closely related to star formation. The detection of compact, high brightness temperature cores in several nearby radio-quiet AGNs can be explained by the coexistence of two components, one non-evolving and AGN related and one evolving and star formation related. Radio-quiet AGNs are an important class of sub-millijansky sources, accounting for similar to 30% of the sample and similar to 60% of all AGNs, and outnumbering radio-loud AGNs at less than or similar to 0.1 mJy. This implies that future, large area sub-millijansky surveys, given the appropriate ancillary multiwavelength data, have the potential of being able to assemble vast samples of radio-quiet AGNs, bypassing the problems of obscuration that plague the optical and soft X-ray bands.
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