The virial mass discrepancy in groups and clusters of galaxies

Details The virial mass discrepancy in groups and clusters of galaxies The virial mass discrepancy in groups and clusters of galaxies

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..345h&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Jan. 15, 1978, p. 345-351.

Astronomy and Astrophysics

Astrophysics

15

Astrophysics, Cosmology, Galactic Clusters, Virial Theorem, Density Distribution, Group Velocity, Mass Distribution, Spiral Galaxies

Scientific paper

Evidence is presented to show that the virial-mass discrepancy depends on the density of the group. Application of the virial theorem to galaxies in 17 high-density groups yields M/L ratios of approximately 7 out to distances of about 100 kpc. Among the low-density groups, statistically significant correlations are found between the group velocity dispersion and group radius. These correlations are interpreted either within the expansion hypothesis or as due to the groups' being bound in the presence of a negative cosmological constant. There appears to be little support for the massive halo hypothesis in its usual form.

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