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The Phoenix survey: optical and near-infrared observations of faint radio sources | | A. Georgakakis
; B. Mobasher
; L. Cram
; A. Hopkins
; C. Lidman
; M. Rowan-Robinson
; | | Date: |
1 Mar 1999 | | Subject: | astro-ph | | Affiliation: | 1,2), B. Mobasher, L. Cram, A. Hopkins, C. Lidman, M. Rowan-Robinson ( School of Physics and Astronomy, University of Birmingham, Edgbaston, UK, Astrophysics Group, Blackett Laboratory, Imperial College, London UK, Astrophysics Department, School of | | Abstract: | Using a deep Australia Telescope Compact Array (ATCA) radio survey covering an area of ~3deg^{2} to a 4sigma sensitivity of ge 100 muJy at 1.4GHz, we study the nature of faint radio galaxies. About 50% of the detected radio sources are identified with an optical counterpart revealed by CCD photometry to m_{R}=22.5 mag. Near-infrared (K-band) data are also available for a selected sample of the radio sources, while spectroscopic observations have been carried out for about 40% of the optically identified sample. These provide redshifts and information on the stellar content. Emission-line ratios imply that most of the emission line sources are star-forming galaxies, with a small contribution (approx 10%) from Sy1/Sy2 type objects. We also find a significant number of absorption line systems, likely to be ellipticals. These dominate at high flux densities (> 1 mJy) but are also found at sub-mJy levels. Using the Balmer decrement we find a visual extinction A_{V}=1.0 for the star-forming faint radio sources. This moderate reddening is consistent with the V-R and R-K colours of the optically identified sources. For emission line galaxies, there is a correlation between the radio power and the Halpha luminosity, in agreement with the result of Benn et al. (1993). This suggests that the radio emission of starburst radio galaxies is a good indicator of star-formation activity. | | Source: | arXiv, astro-ph/9903016 | | Services: | Forum | Review | PDF | Favorites | |
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