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The Velocity Distribution in the Solar Neighborhood from LAMOST Pilot Survey

Published online by Cambridge University Press:  06 January 2014

Qiran Xia ,
Chao Liu ,
Yan Xu ,
Shude Mao  and
Shuang Gao
Qiran Xia
Affiliation:
National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: qiranxia@gmail.com University of Chinese Academy of Sciences, Beijing 100049, China
Chao Liu
Affiliation:
National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: qiranxia@gmail.com Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China
Yan Xu
Affiliation:
National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: qiranxia@gmail.com Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China
Shude Mao
Affiliation:
National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: qiranxia@gmail.com Jodrell Bank Centre for Astrophysics, The University of Manchester, Alan Turing Building, Manchester M13 9PL, UK
Shuang Gao
Affiliation:
National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: qiranxia@gmail.com Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China
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Abstract

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We use 63,774 F/G dwarf stars from the LAMOST pilot survey to explore the velocity distribution in the solar neighborhood. The intrinsic UV distribution is reconstructed with a 20-Gaussian model using extreme deconvolution. We find at least two arcs, one extending from (−106, −3) to (94, −27) km/s and the other from (29, −9) to (78, −51) km/s. The arcs are qualitatively consistent with numerical simulations of the resonance induced by the Galactic bar and can be used to constrain its dynamical properties.

Keywords

Solar NeighbourhoodStarsVelocities

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