Faint companions of isolated 2MIG galaxies
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- Karachentseva, V.E., Karachentsev, I.D. & Melnyk, O.V. Astrophys. Bull. (2011) 66: 389. doi:10.1134/S1990341311040018
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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 Rp < 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.