Kinematical properties of the members of Hickson group No.90

Details Kinematical properties of the members of Hickson group No.90 Kinematical properties of the members of Hickson group No.90

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..418l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 2, p. 418-424

Astronomy and Astrophysics

Astrophysics

23

Elliptical Galaxies, Galactic Clusters, Interacting Galaxies, Kinematics, Morphology, Radial Velocity, Spiral Galaxies, Velocity Distribution, Charge Coupled Devices, Data Processing, Spectrographs, Stellar Luminosity, Stellar Mass, Telescopes

Scientific paper

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 NGC7173 and NGC7174 and that NGC7176 is virtually undisturbed. The kinematical data can be used to put constraints on the geometry of the encounter. NGC7173 is closer to the observer than NGC7174, while the latter is receding from the companion at a velocity of approximately 280 km/s stripping the outer regions of NGC7173. At the same time, the outer regions of NGC7174 are slowed with respect to the central ones by the tidal action of NGC7174. 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.

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