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Issue A&A
Volume 464, Number 2, March III 2007
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20066159



A&A 464, L1-L4 (2007)
DOI: 10.1051/0004-6361:20066159

Letter

Large-scale HI in nearby radio galaxies: segregation in neutral gas content with radio source size

B. H. C. Emonts1, 2, R. Morganti1, 3, T. A. Oosterloo1, 3, J. M. van der Hulst1, G. van Moorsel4, and C. N. Tadhunter5

1  Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
2  Department of Astronomy, Columbia University, Mail Code 5246, 550 West 120th Street, New York, NY 10027, USA
    e-mail: emonts@astro.columbia.edu
3  Netherlands Foundation for Research in Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
4  National Radio Astronomy Observatory, Socorro, NM 87801, USA
5  Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK

(Received 1 August 2006 / Accepted 22 December 2006)

Abstract
We present results of a study of neutral hydrogen (H I) in a complete sample of nearby non-cluster radio galaxies. We find that radio galaxies with large amounts of extended H I ($M_{\rm H{\,\small I}} \gtrsim 10^9~M_{\odot}$) all have a compact radio source. The host galaxies of the more extended radio sources, all of Fanaroff & Riley type-I, do not contain these amounts of H I. We discuss several possible explanations for this segregation. The large-scale H I is mainly distributed in disk- and ring-like structures with sizes up to 190 kpc and masses up to $2 \times 10^{10}~M_{\odot}$. The formation of these structures could be related to past merger events, although in some cases it may also be consistent with a cold-accretion scenario.


Key words: galaxies: active -- galaxies: interactions -- galaxies: cooling flows -- galaxies: ISM -- ISM: jets and outflows



© ESO 2007


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