EDP Sciences
Free Access
Volume 444, Number 1, December II 2005
Page(s) L9 - L13
Section Letters
DOI https://doi.org/10.1051/0004-6361:200500197
Published online 21 November 2005

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


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

R. Morganti1, 2, C. N. Tadhunter3 and T. A. Oosterloo1, 2

1  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 )

We report the detection of fast (~1000 $\,$km$\,$s-1), massive outflows of neutral gas observed - using the WSRT - as 21-cm $\ion{H}{i}$ 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 $M_\odot$ 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

SIMBAD Objects

© ESO 2005

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.