期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 428, 期 1, 页码 912-922出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sts089
关键词
Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: structure
资金
- Natural Sciences and Engineering Research Council of Canada
We present a mass model for the Milky Way, which is fitted to observations of the Sagittarius stream together with constraints derived from a wide range of photometric and kinematic data. The model comprises a Sersic bulge, an exponential disc and an Einasto halo. Our Bayesian analysis is accomplished using an affine-invariant Markov chain Monte Carlo algorithm. We find that the best-fitting dark matter halo is triaxial with axis ratios of 3.3 +/- 0.7 and 2.7 +/- 0.4 and with the short axis approximately aligned with the Sun-Galactic Centre line. Our results are consistent with those presented in Law & Majewski. Such a strongly aspherical halo is disfavoured by the standard cold dark matter scenario for structure formation.
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