A&A 444, L9-L13 (2005)
DOI: 10.1051/0004-6361:200500197

Letter

Fast neutral outflows in powerful radio galaxies: a major source of feedback in massive galaxies

R. Morganti^{1, 2}, C. N. Tadhunter³ and T. A. Oosterloo<sup>1, 2

1</sup>  Netherlands Foundation for Research in Astronomy, Postbus 2, 7990 AA, Dwingeloo, The Netherlands
    e-mail: morganti@astron.nl
²  Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
³  Dep. Physics and Astronomy, University of Sheffield, Sheffield, S7 3RH, UK

(Received 6 September 2005 / Accepted 5 October 2005 )

Abstract
We report the detection of fast (~1000 kms^-1), massive outflows of neutral gas observed - using the WSRT - as 21-cm absorption against the strong radio continuum of seven radio sources. The neutral outflows occur, in at least somes cases, at kpc distance from the nucleus, and they are most likely driven by the interactions between the expanding radio jets and the gaseous medium enshrouding the central regions. We estimate that the associated mass outflow rates are up to ~50 yr^-1, comparable (although at the lower end of the distribution) to the outflow rates found for starburst-driven superwinds in Ultra Luminous IR Galaxies (ULIRG). This suggests that massive, jet-driven outflows of neutral gas in radio-loud AGN can have as large an impact on the evolution of the host galaxies as the outflows associated with starbursts. A radio-loud phase of the AGN is likely a relatively common, albeit short, phase in the life of many (or even all) massive ellipticals. Jet-driven neutral outflows may represent one of the main feedback mechanisms in these galaxies.

Key words: galaxies: active -- galaxies: ISM

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© ESO 2005

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