Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-14
Astrophys.J.659:149-161,2007
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ. 18 pages text plus figures. High resolution version available at http://www.astro.umd.edu/~
Scientific paper
10.1086/511807
We examine the amplitude of the rotation velocity that can be attributed to the dark matter halos of disk galaxies, focusing on well measured intermediate radii. The data for 60 galaxies spanning a large range of mass and Hubble types, taken together, are consistent with a dark halo velocity log(Vh) = C + B log(r) with C = 1.47 (+0.15, -0.19) and B = 1/2 over the range 1 < r < 74 kpc. The range in C stems from different choices of the stellar mass estimator, from minimum to maximum disk. For all plausible choices of stellar mass, the implied densities of the dark halos are lower than expected from structure formation simulations in LCDM, which anticipate C > 1.6. This problem is not specific to a particular type of galaxy or to the innermost region of the halo (cusp or core); the velocity attributable to dark matter is too low at all radii.
de Blok J. G. W.
Kim Heon Jung
Kuzio de Naray Rachel
McGaugh Stacy S.
Schombert James M.
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