Reference : Faint companions of isolated 2MIG galaxies
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Faint companions of isolated 2MIG galaxies
Karachentseva, V. E. [Main Astronomical Observatory, National Academy of Sciences]
Karachentsev, I. D. [Special Astrophysical Observatory, Russian Academy of Sciences]
Melnyk, Olga mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)]
Astrophysical Bulletin
Yes (verified by ORBi)
[en] astronomical databases: catalogs ; galaxies: dwarf ; galaxies: evolution ; galaxies: formation
[en] 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 Δ V < 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, 63 Msolar/Lsolar, is significantly greater than that found from the spiral galaxy companions (17 Msolar/Lsolar). We note that a fraction of 2MIG galaxies with companions may be a part of low-contrast diffuse structures: clouds and filaments.
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