Journal
ASTROPHYSICAL JOURNAL
Volume 872, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ab0104
Keywords
Galaxy: disk; Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; Galaxy: structure; solar neighborhood
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Funding
- National Natural Science Foundation of China [11890694, 11390371]
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Gaia DR2 data are used to calculate the Oort constants and derive the Galactic rotational properties in this work. We choose the solar vicinity stars with a clean sample within 500 pc. The Oort constants are then fitted through the relation between the proper motions as a function of Galactic longitude l. A maximum likelihood method is adopted to obtain the Oort constants and the uncertainties are produced by a Markov Chain Monte Carlo technique with the sample. Our results for the Oort constants are A = 15.1 +/- 0.1 kms(-1) kpc(-1), B = -13.4 +/- 0.1 kms(-1) kpc(-1), C = -2.7 +/- 0.1 kms(-1) kpc(-1), and K = -1.7 +/- 0.2 kms(-1) kpc(-1) respectively. The nonzero values of C and K represent a nonaxisymmetric model for the Galaxy. According to our results, the angular velocity Omega = vertical bar A - B vertical bar = 28.5. 0.1 km s(-1) kpc(-1) and the circular velocity decreases in solar vicinity. The local radial velocity also decreases along the radial direction due to C + K being negative.
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