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Stars with fast Galactic rotation observed in Gaia TGAS: A signature driven by the Perseus arm?

Hunt, JAS, Kawata, D, Monari, G, Grand, RJJ, Famaey, B and Siebert, A (2016) Stars with fast Galactic rotation observed in Gaia TGAS: A signature driven by the Perseus arm? Monthly Notices of the Royal Astronomical Society: Letters, 467 (1). L21-L25. ISSN 1745-3925

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We report on the detection of a small overdensity of stars in velocity space with systematically higher Galactocentric rotation velocity than the Sun by about 20 km s-1 in the Gaia Data Release 1 Tycho-Gaia astrometric solution data. We find these fast Galactic rotators more clearly outside of the Solar radius, compared to inside of the Solar radius. In addition, the velocity of the fast Galactic rotators is independent of the Galactocentric distance up to R-R0 ~ 0.6 kpc. Comparing with numerical models, we qualitatively discuss that a possible cause of this feature is the co-rotation resonance of the Perseus spiral arm, where the stars in the peri-centre phase in the trailing side of the Perseus spiral arm experience an extended period of acceleration owing to the torque from the Perseus arm.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
SWORD Depositor: A Symplectic
Date Deposited: 19 Apr 2023 11:11
Last Modified: 19 Apr 2023 11:11
DOI or ID number: 10.1093/mnrasl/slw257
URI: https://researchonline.ljmu.ac.uk/id/eprint/19343
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