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|Hickson 96: a physical compact group.|
We analyze the morphology and dynamics of the galaxies of the Hickson 96compact group by means of deep CCD images in the B, V and R photometricbands and long-slit spectroscopy. The four galaxies of this spiral richgroup show signs of gravitational interaction. Two long tails come outfrom the contact region of the close pair H96ac. It is also there whereboth galaxies, bi-symmetrical in their inner parts, loose one of theirarms. Moreover, both the photometric and kinematical center of H96a aredisplaced relative to the center of the disk. H96b, a giant ellipticalgalaxy, shows significant deviations from a r^1/4^ law at the innerparts and small rotation along its major axis. We find at the centre ofthe galaxy an elongated component which is kinematically decoupled. Awide faint plume seems to emerge from this galaxy. H96d, the smallestgalaxy of the group, seems to be influenced by the bigger members, asindicated by three prominent knots of recent bursts of star formation inits blue disk, and by hints of optical bridges joining H96d with H96aand b. Finally the group has a low velocity dispersion (160km/s) and iswell isolated - no galaxies with comparable magnitude to H96a or H96bare found in its neighborhood. All these results lead us to concludethat Hickson 96 constitutes a real physical system.
|The nature of the N-galaxy 3 C 120|
Photometric and spectroscopic data for the nucleus and the nebulosity ofthe N galaxy 3 C 120 are discussed. The He I 4471-A line is not detectedand the He I 5876-A/H-beta line ratio is similar to that foundpreviously. The results confirm the stellar nature of the nebulositysurrounding the nucleus and show that the galaxy can be represented by aquasar of moderate luminosity at the center of an early-type spiral. Adisk with an inclination of about 45 degrees is also implied. An M/Lratio of about 8 and an upper limit for M(H I)/M of 0.02 are found. Itis suggested that the extranuclear emission is due to photoionization byhot stars and that the galaxy is experiencing generalized stellarformation activity.
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