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For refcode 1994A&A...282..418L:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...282..418L Kinematical properties of the members of Hickson group No.90 Giuseppe Longo, Giovanni Busarello, Hilmar Lorenz, Gotthard Richter, and Simone Zaggia Osservatorio Astronomico di Capodimonte, via Moiariello 16,I-80131 Napoli, Italy Potsdam Astrophysical Institute, an den Sternwarte 16, D-01561 Potsdam, Germany Department of Astronomy, University of Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy Received November 19, 1992; accepted August 16,1993 Abstract. We present here stellar radial velocity and velocity dispersion profiles along several position angles for the four members of Hickson's Compact Group No. 90. In order to reach fainter light levels and to measure the effects of tidal interactions on the kinematics, the data have been processed with a new vectorial adaptive filtering technique. We find that a strong, slow interaction is beginning to take place between NGC 7173 and NGC 7174 and that NGC 7176 is virtually undisturbed. The kinematical data can be used to put constraints on the geometry of the encounter. NGC 7173 is closer to the observer than NG7 7174, while the latter is receding from the companion at a velocity of ~280 km s^-1^ stripping the outer regions of NGC 7173. At the same time, the outer regions of NGC 7174 are slowed with respect to the central ones by the tidal action of NGC 7174. According to previous findings, the M/L ratio for the individual galaxies in the group turns out to be about 30-50% smaller than for field galaxies. Key words: galaxies: interaction - galaxies: kinematics and dynamics of - galaxies: individual: NGC 7172, NGC 7173, NGC 7174, NGC 7176
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