Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...464l...1e&link_type=abstract
Astronomy and Astrophysics, Volume 464, Issue 2, March III 2007, pp.L1-L4
Astronomy and Astrophysics
Astrophysics
19
Galaxies: Active, Galaxies: Interactions, Galaxies: Cooling Flows, Galaxies: Ism, Ism: Jets And Outflows
Scientific paper
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 (MH I ≳ 10^9~M&sun;) 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 × 1010~M&sun;. 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 H. C. B.
Morganti Rafaella
Oosterloo Thomas A.
Tadhunter Clive N.
van der Hulst J. M.
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