Journal Article

Radio constraints on the volume filling factors of AGN winds

A. J. Blustin and A. C. Fabian

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1732-1736
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI:
Radio constraints on the volume filling factors of AGN winds

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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.

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

Journal Article.  4066 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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