Dark matter in elliptical galaxies

Details Dark matter in elliptical galaxies Dark matter in elliptical galaxies

1995-01-13

arxiv.org/abs/astro-ph/9501046v1

Astrophys.J. 441 (1995) L25

Astronomy and Astrophysics

Astrophysics

15 pages, uuencoded compressed PostScript, includes 3 figures

Scientific paper

10.1086/187780

We present measurements of the shape of the stellar line-of-sight velocity distribution out to two effective radii along the major axes of the four elliptical galaxies NGC 2434, 2663, 3706, and 5018. The velocity dispersion profiles are flat or decline gently with radius. We compare the data to the predictions of f=f(E,L_z) axisymmetric models with and without dark matter. Strong tangential anisotropy is ruled out at large radii. We conclude from our measurements that massive dark halos must be present in three of the four galaxies, while for the fourth galaxy (NGC 2663) the case is inconclusive.

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