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THE VERY LARGE ARRAY SURVEY OF THECHANDRADEEP FIELD SOUTH. IV. SOURCE POPULATION
- Source :
- The Astrophysical Journal. 694:235-246
- Publication Year :
- 2009
- Publisher :
- American Astronomical Society, 2009.
-
Abstract
- We present a detailed analysis of 256 radio sources from our deep (flux density limit of 42 microJy at the field centre at 1.4 GHz) Chandra Deep Field South 1.4 and 5 GHz VLA survey. The radio population is studied by using a wealth of multi-wavelength information in the radio, optical, and X-ray bands. The availability of redshifts for ~ 80% of the sources in our complete sample allows us to derive reliable luminosity estimates for the majority of the objects. X-ray data, including upper limits, for all our sources turn out to be a key factor in establishing the nature of faint radio sources. Due to the faint optical levels probed by this study, we have uncovered a population of distant Active Galactic Nuclei (AGN) systematically missing from many previous studies of sub-millijansky radio source identifications. 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. 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. The ratio of radio to optical luminosity depends more on radio luminosity, rather than being due to optical absorption.
- Subjects :
- Physics
education.field_of_study
Active galactic nucleus
Radio galaxy
Astrophysics::High Energy Astrophysical Phenomena
media_common.quotation_subject
Population
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Galaxy
Redshift
Luminosity
Space and Planetary Science
Sky
Chandra Deep Field South
education
Astrophysics::Galaxy Astrophysics
media_common
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 694
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....3284bd9f3de65c4c2b6dffec931ceac1