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

被引：15
作者：
Emonts, B. H. C.
Morganti, R.
Oosterloo, T. A.
van der Hulst, J. M.
van Moorsel, G.
Tadhunter, C. N.
机构：
[1] Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands
[2] Columbia Univ, Dept Astron, New York, NY 10027 USA
[3] Netherlands Fdn Res Astron, NL-7990 AA Dwingeloo, Netherlands
[4] Natl Radio Astron Observ, Socorro, NM 87801 USA
[5] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
来源：
ASTRONOMY & ASTROPHYSICS | 2007年 / 464卷 / 02期
关键词：
galaxies : active; galaxies : interactions; galaxies : cooling flows; galaxies : ISM; ISM : jets and outflows;
D O I：
10.1051/0004-6361:20066159
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：L1 / L4
页数：4
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