Astrophysical Bulletin

, Volume 66, Issue 4, pp 389–406

Faint companions of isolated 2MIG galaxies

  • V. E. Karachentseva
  • I. D. Karachentsev
  • O. V. Melnyk
Article

DOI: 10.1134/S1990341311040018

Cite this article as:
Karachentseva, V.E., Karachentsev, I.D. & Melnyk, O.V. Astrophys. Bull. (2011) 66: 389. doi:10.1134/S1990341311040018

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 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.

Keywords

astronomical databases: catalogs galaxies: dwarf galaxies: evolution galaxies: formation 

Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • V. E. Karachentseva
    • 1
  • I. D. Karachentsev
    • 2
  • O. V. Melnyk
    • 3
    • 4
  1. 1.Main Astronomical ObservatoryNational Academy of SciencesKievUkraine
  2. 2.Special Astrophysical ObservatoryRussian Academy of SciencesNizhnii ArkhyzRussia
  3. 3.Institut d’Astrophysique et de GeophysiqueUniversité de LiègeLiegeBelgium
  4. 4.Astronomical ObservatoryTaras Shevchenko UniversityKievUkraine

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