Abstract
Galaxies occur in a wide variety of systems ranging from binary pairs through small groups to rich clusters. These systems in turn possess a wide range of densities, with typical separations between bright (L ≳ L* = 3.4 × 1010 L⊙) galaxies varying from ≲ 10 kpc up to ~ 1 Mpc. Among the most common of these systems are small, loose groups containing ≲ 10 bright galaxies with separations ≳ 100 kpc. Such systems probably contain a substantial fraction of all galaxies (de Vaucouleurs 1975; van den Bergh 1962; Karachentseva 1973). Familiar examples include the Local Group and M81 group.
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References
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Turner, E.L. (1978). Optical Studies of Small Groups of Galaxies. In: Longair, M.S., Einasto, J. (eds) The Large Scale Structure of the Universe. International Astronomical Union / Union Astronomique Internationale, vol 79. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9843-8_3
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DOI: https://doi.org/10.1007/978-94-009-9843-8_3
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