A group of galaxies around the giant spiral NGC 6946

Details A group of galaxies around the giant spiral NGC 6946 A group of galaxies around the giant spiral NGC 6946

2000-10-07

arxiv.org/abs/astro-ph/0010148v1

Astronomy & Astrophysics Vol. 362 Issue 2, pp.544-556

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, figure 1 is only in jpeg format and figures 2,3 are only in gif format for space economy

Scientific paper

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 +- 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, and a virial mass-to-luminosity ratio about 56 M_sun/L_sun.

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