HI absorption in radio galaxies
R. Morganti, T. A. Oosterloo, G. van Moorsel, C. N. Tadhunter, N. Killeen
Abstract
Twenty-two powerful radio galaxies have been searched for HI absorption. We find the highest probability of detecting HI in absorption among narrow-line compact (or small) galaxies or galaxies with indication of richer interstellar medium (i.e. with ongoing or recent star-formation). We discuss the difficulty in the interpretation of the origin of the HI absorption due to the uncertainty in the systemic velocity of the galaxies.
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