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Astron. Astrophys. 362, 544-556 (2000)

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A group of galaxies around the giant spiral NGC 6946

I.D. Karachentsev 1, M.E. Sharina 1 and W.K. Huchtmeier 2

1 Russian Academy of Sciences, Special Astrophysical Observatory, N.Arkhyz, KChR, 369167, Russia
2 Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany

Received 16 May 2000 / Accepted 25 July 2000


We present large-scale CCD images of a dozen low surface brightness objects in the vicinity of giant Sc galaxy NGC 6946, which have been found recently on POSS-II copies. Six of them: UGC 11583, kk251, kk252, kkr55, kkr56, and kkr59 are dwarf irregular galaxies resolved into stars. We determined their distances from the luminosity of the brightest blue stars. The mean estimated distance to the NGC 6946 group is 5.9[FORMULA]0.4 Mpc. Together with Cepheus 1, discovered before, the group consist of 8 late type galaxies. Almost all of them are detected or marginally detected in the HI line. The group is characterized by a linear projected diameter of 420 kpc, a radial velocity dispersion of 95 km s-1, and a virial mass-to-luminosity ratio about 56 [FORMULA].

Key words: galaxies: dwarf – galaxies: individual: NGC 6946 – galaxies: photometry

© European Southern Observatory (ESO) 2000

Online publication: October 24, 2000