Are the virial masses of clusters smaller than we think?

Details Are the virial masses of clusters smaller than we think? Are the virial masses of clusters smaller than we think?

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8718481c&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Astronomy, Gas Density, Hydrostatics, Mass Distribution, Star Clusters, Stellar Mass, Light (Visible Radiation), X Ray Spectra

Scientific paper

The constraints that the available X-ray spectral and imaging data place on the mass distribution and mass to light ratio of rich clusters are considered. It was found for the best determined cases that the mass to light ratio is less than 125 h50 at radii exceeding 1 h50 Mpc. The mass to light ratio is approximately constant at radii exceeding 1 h50 Mpc but may rise to values of roughly 200 h50 in the central regions. The fraction of the total mass that is in baryons, primarily the hot X-ray emitting gas, is roughly 30% thus setting the mass to light ratio of the dark material to roughly 70. The model that fits the X-ray data for Coma is in good agreement with the observed optical velocity dispersion vs. radius data.

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