Quantitative morphology of isolated E/S pairs of galaxies

Details Quantitative morphology of isolated E/S pairs of galaxies Quantitative morphology of isolated E/S pairs of galaxies

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259...43r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 43-60.

Astronomy and Astrophysics

Astrophysics

35

Astronomical Photometry, Elliptical Galaxies, Galactic Evolution, Galactic Structure, Spiral Galaxies, Charge Coupled Devices, Interacting Galaxies

Scientific paper

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 about 13/11 elliptical + spiral pairs in the present sample. The remaining objects include about 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 percent 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 percent 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.

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