Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7701n&link_type=abstract
American Astronomical Society Meeting 210, #77.01; Bulletin of the American Astronomical Society, Vol. 39, p.184
Mathematics
Logic
Scientific paper
We have searched for gravitating, non-luminous galaxies which might manifest themselves as the missing companions to "isolated" ring galaxies (i.e. ring galaxies without any plausible optically identified collider). Out of 105 morphologically cataloged ring galaxies we find not a single compelling example of an isolated ring, and by logical extension we find no evidence in this sample, for a population of dark companion galaxies, as is predicted by most Lambda-CDM models of structure formation. We extend the search to bodily-deformed galaxies found in the Arp Atlas, and of those galaxies showing deformations (likely due to gravitational interactions) we find only a handful of examples not having a plausible intruder. Inverting the question at hand we also have examined all of the objects in the Karachentsev Catalog of Isolated Galaxies. Only 27 (3%) show any obvious signs of deformation and/or asymmetry, none of which would qualify them to be described as peculiar in the dramatic sense of the Arp Atlas. One exception, which has a prominent tail and high degree of asymmetry, is easily explained as a conventional, advanced merger.
Nelson Erica
Petrillo Kristen
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