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Published online by Cambridge University Press: 03 August 2017
The 18-cm and 21-cm surveys of luminous infrared galaxies achieved with the Nanlay radiotelescope led to the detection of OH and/or HI absorption lines in 7 bright IRAS galaxies. We show that a careful comparison of optical radial velocities and 1) HI absorption line radial velocities or 2) HI emission line radial velocities gives valuable indication on the radial motions of the circumnuclear gas in our sample of galaxies and in the IRAS galaxies studied by Mirabel and Sander (1988).