Large-scale HI structures and the origin of radio galaxies

Details Large-scale HI structures and the origin of radio galaxies Large-scale HI structures and the origin of radio galaxies

2003-01-24

arxiv.org/abs/astro-ph/0301496v1

New Astron.Rev. 47 (2003) 273-277

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures. To appear in the proceedings of the conference "Radio Galaxies: Past, present and future", Leiden, 11-15 N

Scientific paper

10.1016/S1387-6473(03)00038-1

We present the first results of a study aimed to detect large HI structures in radio galaxies. In two of the three cases presented (Coma A and B2 0648+27), the detection of a large amount of HI distributed over several tens of kpc suggests a major merger as origin of the observed system and allows to infer when this merger must have occurred. The situation is less clear for the third object (3C 433). We propose an evolutionary sequence for one of the radio galaxies studied. The implications of this study of neutral hydrogen in nearby radio galaxies for high-z objects and ``normal'' (i.e. radio-quiet) elliptical galaxies are also discussed.

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