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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The rotation velocity attributable to dark matter at intermediate radii in disk galaxies
Astrophysical Journal, Volume 659, No. 1 I, Year 2007
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Description
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 = 1.47-0.19+0.15 and B ≈1/2 over the range of 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 ACDM, 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. © 2007. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
McGaugh, Stacy S.
United States, College Park
University of Maryland, College Park
de Blök, Willem J.G.
Australia, Canberra
The Australian National University
Schombert, James M.
United States, Eugene
University of Oregon
de Naray, Rachel Kuzio
United States, College Park
University of Maryland, College Park
Kim, Jihoon
United States, College Park
University of Maryland, College Park
Statistics
Citations: 92
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1086/511807
ISSN:
0004637X