期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 313, 期 2, 页码 209-216出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2000.02905.x
关键词
Galaxy : kinematics and dynamics; solar neighbourhood; Galaxy : structure; dark matter
We determine the velocity distribution and space density of a volume-complete sample of A and F stars, using parallaxes and proper motions from the Hipparcos satellite. We use these data to solve for the gravitational potential vertically in the local Galactic disc, by comparing the Hipparcos measured space density with predictions from various disc models. We derive an estimate of the local dynamical mass density of 0.102 +/- 0.010 pc(-3), which may be compared with an estimate of 0.095 M. pc(-3) in visible disc matter. Our estimate is found to be in reasonable agreement with other estimates by Creze et al. and Pham, also based on Hipparcos data. We conclude that there is no compelling evidence for significant amounts of dark matter in the disc.
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