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28 March 2024
 
  » arxiv » astro-ph/0701435

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The role of neutral hydrogen in radio galaxies
B.H.C. Emonts ; R. Morganti ; T.A. Oosterloo ;
Date 16 Jan 2007
AbstractWe present morphological and statistical results of a study of neutral hydrogen (HI) in a complete sample of nearby, non-cluster radio galaxies. We detect large-scale HI emission in the early-type host galaxies of 25% of our sample sources. 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. All radio galaxies with M_HI >= 10^9 M_solar have a compact radio source. When we compare our sample of radio-loud early-type galaxies with samples of radio-quiet early-type galaxies there appears to be no significant difference in HI properties (mass, morphology and detection rate). This suggests that that the radio-loud phase could be just a short phase that occurs at some point during the life-time of many, or even all, early-type galaxies.
Source arXiv, astro-ph/0701435
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