Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743030c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #430.30; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Radio emission from faint radio populations (sub-mJy) is powered by star formation and low luminosity AGN. Distinguishing between the two, however, relies on several inexact methods. One such method, the FIR-radio correlation, locates star formation powered radio sources, but is contaminated by sources classified as AGN by their optical SEDs. Especially for sources without available spectroscopy, conclusions based on the broad-band optical/NIR SED may be affected by high levels of dust attenuation around sites of high star formation. Even for objects with available IR photometry, where the FIR-radio correlation may be used to identify star-formation powered radio sources, there have been claims that it might be contaminated by low-luminosity AGNs. By looking into a faint radio source population and combining a multi-wavelength catalog with optical morphology, we were able to investigate the nature of faint radio sources by including the analysis of their structural properties and high resolution color images. In particular, probing the population of red sequence objects revealed many sources of late-type morphology. While some of these may be quiescent disk galaxies, it seems likely that a significant fraction of the red sequence of the radio selected sample is made of reddened star-forming sources.
Connor Thomas
Pannella Maurilio
Strazzullo Veronica
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