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.
Dark matter in bright X-ray ellipticals
DE PAOLIS, Francesco;INGROSSO, Gabriele
1997-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
