, Volume 66, Issue 4, pp 389-406
Date: 26 Nov 2011

Faint companions of isolated 2MIG galaxies

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Abstract

We present the results of a search for companions around the isolated galaxies from the 2MIG catalog. Among 3227 2MIG galaxies we detected 125 objects with a total of 214 neighbors having radial velocity differences of ΔV < 500 km/s and projected separations of R p < 500 kpc relative to the 2MIG galaxies. The median luminosity of the companions is 1/25 of the luminosity of catalog galaxies, which has little effect on the dynamic isolation of the latter. The median ratio of the orbital mass to the K-luminosity determined from 60 companions of E and S0 2MIG galaxies, 63M /L , is significantly greater than that found from the spiral galaxy companions (17M /L ). We note that a fraction of 2MIG galaxies with companions may be a part of low-contrast diffuse structures: clouds and filaments.

Original Russian Text © V. E. Karachentseva, I. D. Karachentsev, O. V. Melnyk, 2011, published in Astrofizicheskii Byulleten, 2011, Vol. 66, No. 4, pp. 421–435.