Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-16
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures. Accepted for publication in A&A Letters. A version with full resolution figures can be found at http://w
Scientific paper
We present results of a study of neutral hydrogen (HI) in a complete sample of nearby non-cluster radio galaxies. We find that radio galaxies with large amounts of extended HI (M_HI >= 10^9 M_solar) 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 HI. We discuss several possible explanations for this segregation. The large-scale HI is mainly distributed in disk- and ring-like structures with sizes up to 190 kpc and masses up to 2 x 10^10 M_solar. 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.
Emonts Bjorn H. C.
Morganti Rafaella
Oosterloo Thomas A.
Tadhunter Clive N.
van der Hulst J. M.
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