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The Galactic rotation curve from red clump stars

Published online by Cambridge University Press:  06 January 2014

Chao Liu ,
Glenn van de Ven ,
Min Fang ,
Yue Wu ,
Kenneth Carrell  and
Xiangxiang Xue
Chao Liu
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: [email protected]
Glenn van de Ven
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
Min Fang
Affiliation:
Purple Mountain Observatory and Key Laboratory for Radio Astronomy, Chinese Acedamy of Sciences, 2 West Beijing Road, 210008, Nanjing, China
Yue Wu
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: [email protected]
Kenneth Carrell
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: [email protected]
Xiangxiang Xue
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012, Beijing, China email: [email protected] Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
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Abstract

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We use line-of-sight velocities of more than 4000 red clump stars observed from MMT/Hectospec to derive the Galactic rotation curve between 8 and 13 kpc in Galactocentric radius to better than 10 km s−1. A three-component (bulge+disk+halo) with an additional massive ring of 1.66×1010 M⊙ at about 11.6 kpc provides an excellent fit with the observation.

Keywords

Galaxy: diskGalaxy: kinematics and dynamicsGalaxy: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S298: Setting the scene for Gaia and LAMOST , May 2013 , pp. 424
Copyright
Copyright © International Astronomical Union 2014 

References

Sofue, Y. & Robin, V. 2001, ARA&A, 39, 137Google Scholar
Sofue, Y., Homma, M., & Pmodaka, T. 2009, PASJ, 61, 227CrossRefGoogle Scholar