The local group of galaxies

  title={The local group of galaxies},
  author={Sidney van den Bergh},
  journal={The Astronomy and Astrophysics Review},
  • S. Bergh
  • Published 5 August 1999
  • Physics
  • The Astronomy and Astrophysics Review
Hubble's (1936, p. 125) view that the Local Group (LG) is “a typical, small group of nebulae which is isolated in the general field” is confirmed by modern data. The total number of certain and probable Group members presently stands at 35. The half-mass radius of the Local Group is found to be \(R_{\rm h}\approx 350\) kpc. The zero-velocity surface, which separates the Local Group from the field that is expanding with the Hubble flow, has a radius \(R_{\rm o} = 1.18\pm 0.15\) Mpc. The total… 

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