NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-11-17 T09:25:16 PST
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For refcode 1992A&A...259...43R:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1992A&A...259...43R Quantitative morphology of isolated E/S pairs of galaxies R. Rampazzo and J. W. Sulentic Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy Department of Physics and Astronomy, University of Alabama, Box 870324, Tuscaloosa 35487, USA Received September 30, accepted November 30, 1991 Abstract. We present a study of the morphology and geometry for 22 southern E+S pair candidates using high resolution CCD frames obtained at the ESO 2.2 m telescope. We find a considerable number of true mixed pairs with ~13/11 elliptical + spiral pairs in the present sample. The remaining objects include ~3 "disky" pairs (composed of S0 and S members) and 3 "early-type" pairs comprising E and S0 members. We estimate that between 10 and 25% of the pairs in any complete (non-hierarchical) sample will be of the E +S type. This suggests that morphological concordance is not the rule among paired galaxies. We suggest that interaction phenomena and the alterations they produce in galaxy forms may explain many of the mixed pairs. Eight early-type components show possible shell structure while 78% show an isophotal twisting of greater than 10^deg^. Three of these objects and two additional pairs may be mergers in progress based upon their chaotic morphologies. We suggest that the early-type components in many pairs could be merger products. These E+S pairs might then be a transient stage in the coalescence of compact groups. As many as six of the later type components in our sample show arm-like features that may have been produced by the interaction phenomenon. Some of these objects may have been lenticulars perturbed into pseudo spiral forms. Thus many E+S pairs may not have had an origin as morphologically discordant systems. Key words: galaxies: photometry - galaxies: interactions - galaxies: evolution - galaxies: fundamental parameters
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