Models for galaxy halos in an open universe

Simon D.M. White, Dennis Zaritsky

Research output: Contribution to journalArticlepeer-review

87 Scopus citations


We present the properties of simple, self-consistent infall models which embed an " isothermal " dark halo in an open universe. These models depend on one scaling parameter and two shape parameters. The first may be taken to be the circular velocity in the inner regions, and the others to be the density of the universe, Ω, and a measure, e, of the shape of orbits. These models provide a useful description of ensembles of satellite galaxies, or of binary galaxies, because they allow explicitly for the fact that such systems have orbital periods approaching the age of the universe and so cannot have a random orbital phase.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalAstrophysical Journal
Issue number1
StatePublished - 1992


  • Cosmology : Theory
  • Galaxies : Formation
  • Galaxies : Interactions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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