Do elliptical galaxies have dark matter?

Details Do elliptical galaxies have dark matter? Do elliptical galaxies have dark matter?

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phr...307...75l&link_type=abstract

Physics Reports, Vol. 307, No. 1 - 4, p. 75 - 81

Physics

Elliptical Galaxies: Dark Matter, Galactic Halos: Dark Matter

Scientific paper

The authors present constraints on the structure of dark matter halos in elliptical galaxies from the relationship between X-ray temperature and velocity dispersion observed in an optically complete sample. They demonstrate the ubiquity of dark matter in L > L* galaxies, present limits on the dark matter structural parameters, and discuss the scaling of these parameters with optical luminosity. They find that the dark matter is characterized by velocity dispersions that are greater than those of the luminous stars, and that the mass-to-light ratio within six half-light radii for bright elliptical galaxies has a universal value, M/LV ≍ 25h80Msun/LVsun. The latter conclusion is consistent with gravitational lensing studies, but conflicts with the simplest extension of CDM theories of large scale structure formation to galactic scales.

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