Volume 464, Number 2, March III 2007
|Page(s)||L1 - L4|
|Published online||02 January 2007|
Letter to the Editor
Large-scale HI in nearby radio galaxies: segregation in neutral gas content with radio source size
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: email@example.com
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
Accepted: 22 December 2006
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 () 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 . 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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