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Abstract: Abridged We investigate the number of physical companion galaxies for asample of relatively isolated elliptical galaxies. NED has been used toreinvestigate the incidence of satellite galaxies for a sample of 34 ellipticalgalaxies, first investigated by Bothun and Sullivan in a visual search out to aprojected search radius of 75 kpc. We have repeated their originalinvestigation using data cataloged in NED. Nine of these elliptical galaxiesappear to be members of galaxy clusters; the remaining sample of 25 galaxiesreveals an average of +1.0+-0.5 apparent companions per galaxy within aprojected search radius of 75 kpc, in excess of two equal-area comparisonregions displaced by 150-300 kpc. This is significantly larger than the+0.12+-0.42 companions-galaxy found by Bothun and Sullivan for the identicalsample. Making use of published radial velocities identifies physicalcompanions and gives a somewhat lower estimate of +0.4 companions perelliptical galaxy. An expansion of the search radius out to 300 kpc.



Author: Barry F. Madore, Wendy L. Freedman, Gregory D. Bothun

Source: https://arxiv.org/







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