Faint companions of isolated 2MIG galaxies

Karachentseva, V. E.; Karachentsev, I. D.; Melnyk, Olga

doi:10.1134/S1990341311040018

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Faint companions of isolated 2MIG galaxies

Karachentseva, V. E.; Karachentsev, I. D.; Melnyk, Olga

2011 • In Astrophysical Bulletin, 66, p. 389-406

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https://hdl.handle.net/2268/110772

DOI
10.1134/S1990341311040018

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Keywords :

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

Abstract :

[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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Karachentseva, V. E.; Main Astronomical Observatory, National Academy of Sciences

Karachentsev, I. D.; Special Astrophysical Observatory, Russian Academy of Sciences

Melnyk, Olga ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Language :

English

Title :

Faint companions of isolated 2MIG galaxies

Publication date :

01 October 2011

Journal title :

Astrophysical Bulletin

ISSN :

1990-3413

eISSN :

1990-3421

Publisher :

Springer

Volume :

Pages :

389-406

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2011AstBu..66..389K

Commentary :

http://de.arxiv.org/abs/1112.2821

Available on ORBi :

since 31 January 2012

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