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Morphology of interacting elliptical galaxy pairs
The effect of galaxy interaction on the morphology of a galaxy pair wasinvestigated using the results of CCD-photometry of 20 elliptical galaxypairs. Deviations from undisturbed brightness profiles were interpretedin terms of ongoing tidal interaction. It was found that the morphologyof the interacting galaxy pairs deviates obviously from the morphologyof isolated elliptical galaxies, indicating a stage of efficientinteraction, with nonconcentric isophotes providing strong evidence ofongoing interaction. Brightness profiles of the brighter components ingalaxy pairs were usually extended in comparison with brightnessprofiles of isolated galaxies. Truncated brightness profiles, prevalentin most of the smaller components of galaxy pairs, are interpreted as aconsequence of a tidally limited galaxy radius imposed by the moremassive component.
| Double galaxy investigations. I - Observations
Redshift information from 240 A/mm spectrograms is presented for 370double arcsec galaxy systems from the Karachentsev (1972) catalog,including all pairs in that catalog with separation less than 80 arcsec.An extensive error discussion utilizing internal and external (21 cm)comparisons provides calibration of systematic error and determines theuncertainty for a typical high weight optical redshift to be plus orminus 65 km/sec. Internal differential redshifts within single spectrausing common lines achieve accuracies of 18-30 km/sec, depending uponseparation, and are available for about 200 pairs. Extensive informationon emission and other properties is also provided.
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