Groups of galaxies with large crossing times

Details Groups of galaxies with large crossing times Groups of galaxies with large crossing times

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..365k&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 3, Nov. 1980, p. 365-368.

Astronomy and Astrophysics

Astrophysics

2

Galactic Rotation, Galactic Structure, Galaxies, Virial Theorem, Center Of Mass, Hubble Constant, Radial Velocity, Universal Time

Scientific paper

Virial masses of galaxies from the sample of Rood and Dickle (1978) drop at least a factor of 20 if the crossing times are greater than 10-billion. These groups appear to have virial masses equal to those expected if the motions of the member galaxies are caused only by the Hubble expansion. Therefore, a criterion for a group of galaxies to be bound appears to be a crossing-time less than 10-billion years, i.e., half the Hubble time.

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