Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 479, Issue 1, Pages L108-L112Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/sly107
Keywords
Galaxy: disc; Galaxy: evolution; Galaxy: kinematics and dynamics
Categories
Funding
- STFC [ST/H00887X/1, ST/M007073/1, ST/H008861/1, ST/N000811/1] Funding Source: UKRI
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By taking advantage of the superbmeasurements of position and velocity for an unprecedented large number of stars provided in Gaia DR2, we have generated the first maps of the rotation velocity, V-rot, and vertical velocity, V-z, distributions as a function of the Galactocentric radius, R-gal, across a radial range of 5 < R-gal < 12 kpc. In the R - V-rot map, we have identified many diagonal ridge features, which are compared with the location of the spiral arms and the expected outer Lindblad resonance of the Galactic bar. We have detected also radial wave-like oscillations of the peak of the vertical velocity distribution.
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