Mathematics – Logic
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sacm.confe..33b&link_type=abstract
The Starburst-AGN Connection under the Multiwavelength Limelight, held 14-16 September 2011. Published online at http://www.scio
Mathematics
Logic
Scientific paper
Deep radio surveys are a promising window to investigate the evolution of star forming galaxies (SFG) and active galactic nuclei (AGN) for two main reasons: (i) recent theoretical and observational studies agree on the importance of radio emission from AGN as feedback mechanism to their host galaxies, (ii) radio observations are by far less affected by dust extinction compared to similar surveys performed in the optical and the X-ray band. We are therefore studying a sample of 900 radio sources detected at 1.4~GHz in a deep VLA survey of the Extended Chandra Deep Field South (E-CDFS). Thanks to the wealth of data available on this field, we are able to use a multi-wavelength approach to separate AGN from SFG looking at the ratio between their FIR and radio emission, their flux ratio in the optical and radio bands, the level of X-ray luminosity and morphology. The Jy sensitivity of our survey allows us to explore the faint end of the radio population and to detect not only the radio loud AGN, but also significant population of radio quiet objects according to the standard classification. According to our analysis, the radio emission detected in the radio-quiet AGN is produced by star-formation activity rather than accretion of the central SMBH. We have therefore the remarkable opportunity to use the radio emission itself to estimate the star-formation level in the host galaxy. In addition we correlate the accretion level of the radio selected AGN with the stellar masses and morphological appearances of their host.
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