Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995iraj...22..153c&link_type=abstract
Irish Astronomical Journal, 1995, 22(2), 153
Mathematics
Logic
Scientific paper
Statistical studies of binary galaxies indicate the existence of morphological concordance amongst binaries with elliptical components. Previous analyses of observational data indicate that the best agreement is obtained for an orbital eccentricity of 0.25; there are indications that this is probably a preferred state, resulting from evolutionary selection driven by galactic interactions. We study the orbital dynamics and tidal evolution of binaries of similar and mixed morphologies, following the pair to merger, to explore its consequences under these initial conditions. Results indicate that the merger timescale is shortest for binary galaxies with spiral components, leading to a faster depletion of such binaries; thus the mentioned morphological concordance can result from evolutionary selection. Mixed morphology binaries are found to have the longest merger timescales, accounting for the existence of a substantial number of such pairs, though they should be scarce according to the morphology-density relationship.
Chatterjee Tapan K.
Magalinsky V. B.
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