The local density of matter mapped by Hipparcos

Details The local density of matter mapped by Hipparcos The local density of matter mapped by Hipparcos

1998-12-22

arxiv.org/abs/astro-ph/9812404v2

Mon.Not.Roy.Astron.Soc.313:209-216,2000

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures, accepted by MNRAS

Scientific paper

10.1046/j.1365-8711.2000.02905.x

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 solar masses per cubic parsec which may be compared to an estimate of 0.095 solar masses per cubic parsec 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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