Dark matter in bright X-ray ellipticals.

Details Dark matter in bright X-ray ellipticals. Dark matter in bright X-ray ellipticals.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ncimc..20..745d&link_type=abstract

Nuovo Cimento C, Vol. 20C, N. 5, p. 745 - 751

Computer Science

Elliptical Galaxies: X-Ray Surveys, Elliptical Galaxies: Dark Matter, Elliptical Galaxies: Mass Distribution

Scientific paper

Investigates the total mass distribution of bright X-ray ellipticals (with diffuse X-ray luminosity higher than 1041erg s-1) studying the gravitational equilibrium of three component models constituted by stars, hot diffuse gas and dark matter. Assuming a constant mass-to-light ratio for the stars described with anisotropic distribution function in phase space, an emission in X-rays from the hot, diffuse gas, and a dark component in the form of massive fermions, the authors derive constraints on the dark matter distribution by using optical and X-ray data. Comparison of model results with observations does not allow a tight determination of the amount of dark matter which results in 0.4 - 9 times the amount of the stellar mass. The authors investigate the elliptical NGC 4472 for which spectroscopic data of relatively good quality are available.

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