The Local Group in comparison with other nearby groups of galaxies.

Details The Local Group in comparison with other nearby groups of galaxies. The Local Group in comparison with other nearby groups of galaxies.

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305...33k&link_type=abstract

Astronomy and Astrophysics, v.305, p.33

Astronomy and Astrophysics

Astrophysics

42

Galaxies: Local Group, Galaxies: Clusters Of, Dark Matter

Scientific paper

Ensembles of probable physical companions around nearby massive galaxies with V_0_<500km/s and M>3x10^11^Msun_ are derived. Recent estimates of distances for galaxies, a new criterion of membership, and also special searches for diffuse ("spheroidal") dwarf objects have been used for this purpose. Under such an approach the Milky Way has thirteen companions, M31 eleven, M81 fifteen, NGC5128 ten, NGC5236 five, and M101 has seven. According to linear dimension (140kpc), radial velocity dispersion (68km/s), and morphological content (62 percent of E+Sph) the Local Group appears a common one among other systems. Some properties of structure and kinematics of the nearby groups are noted in relation to the luminosity ratio of their two brightest members. The dynamical status of the 6 nearby groups can be explained also without invoking significant amounts of Dark Matter beyond 2-3 standard radii of the principal galaxies.

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