Radio constraints on the volume filling factors of AGN winds |
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| Authors: | A J Blustin A C Fabian |
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| Institution: | Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA |
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| Abstract: | The calculation of mass outflow rates of active galactic nuclei (AGN) winds is of great importance in understanding the role that such winds play in AGN-galaxy feedback processes. The mass outflow rates are, however, difficult to estimate since the volume filling factors of the winds are unknown. In this paper, we use constraints imposed by the observed radio emission to obtain upper limits to the volume filling factors of wind components in certain nearby AGN. We do this by predicting the 1.4 GHz radio flux densities emitted by those components, assuming a uniform wind, and then comparing these with the observed flux densities for each AGN at this frequency. We find that the upper limits to the volume filling factors are in the range of 10?4–0.5 . |
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| Keywords: | quasars: individual: NGC 3516 quasars: individual: IRAS 13349+2438 quasars: individual: MR 2251-178 quasars: individual: MCG-6-30-15 quasars: individual: NGC 3783 radio continuum: galaxies |
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