Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 777, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/777/1/L5
Keywords
Galaxy: disk; Galaxy: kinematics and dynamics; Galaxy: stellar content; Galaxy: structure; stars: kinematics and dynamics
Categories
Funding
- NSF [AST 09-37523, AST 10-09670, DMR 0850934]
- NSFC [10973015]
- NASA/NY
- National Development and Reform Commission
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0937523] Funding Source: National Science Foundation
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We find that Galactic disk stars near the anticenter exhibit velocity asymmetries in both the Galactocentric radial and vertical components across the midplane as well as azimuthally. These findings are based on Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic velocities for a sample of similar to 400,000 F-type stars, combined with proper motions from the PPMXL catalog for which we have derived corrections to the zero points based in part on spectroscopically discovered galaxies and QSOs from LAMOST. In the region within 2 kpc outside the Sun's radius and +/-2 kpc from the Galactic midplane, we show that stars above the plane exhibit net outward radial motions with downward vertical velocities, while stars below the plane have roughly the opposite behavior. We discuss this in the context of other recent findings, and conclude that we are likely seeing the signature of vertical disturbances to the disk due to an external perturbation.
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