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

B. H. C. Emonts*, R. Morganti, T. A. Oosterloo, J. M. van der Hulst, G. van Moorsel, C. N. Tadhunter

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

18 Citaten (Scopus)
194 Downloads (Pure)


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 >= 109 M-circle dot) all have a compact radio source. The host galaxies of the more extended radio sources, all of Fanaro. & 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-circle dot. 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.

Originele taal-2English
Pagina's (van-tot)L1-L4
Aantal pagina's4
TijdschriftAstronomy & astrophysics
Nummer van het tijdschrift2
StatusPublished - mrt-2007

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