The local rotation curve of the Milky Way based on SEGUE and RAVE data

Sysoliatina, K.; Just, A.; Golubov, O.; Parker, Q. A.; Grebel, E. K.; Kordopatis, G.; Zwitter, T.; Bland-Hawthorn, J.; Gibson, B. K.; Kunder, A.; Munari, U.; Navarro, J.; Reid, W.; Seabroke, G.; Steinmetz, M.; Watson, F.

Abstract

Aims. We construct the rotation curve of the Milky Way in the extended solar neighbourhood using a sample of Sloan Extension for Galactic Understanding and Exploration (SEGUE) G-dwarfs. We investigate the rotation curve shape for the presence of any peculiarities just outside the solar radius as has been reported by some authors. Methods. Using the modified Strömberg relation and the most recent data from the RAdial Velocity Experiment (RAVE), we determine the solar peculiar velocity and the radial scale lengths for the three populations of different metallicities representing the Galactic thin disc. Subsequently, with the same binning in metallicity for the SEGUE G-dwarfs, we construct the rotation curve for a range of Galactocentric distances from 7 to 10 kpc. We approach this problem in a framework of classical Jeans analysis and derive the circular velocity by correcting the mean tangential velocity for the asymmetric drift in each distance bin. With SEGUE data we also calculate the radial scale length of the thick disc taking as known the derived peculiar motion of the Sun and the slope of the rotation curve. Results. The tangential component of the solar peculiar velocity is found to be Vo= 4.47 ± 0.8 km s-1and the corresponding scale lengths from the RAVE data are Rd(0 < [Fe/H] < 0.2) = 2.07 ± 0.2 kpc, Rd(-0.2 < [Fe/H] < 0) = 2.28 ± 0.26 kpc and Rd(-0.5 < [Fe/H]

Citation

Sysoliatina, K., Just, A., Golubov, O., Parker, Q. A., Grebel, E. K., Kordopatis, G., Zwitter, T., Bland-Hawthorn, J., Gibson, B. K., Kunder, A., Munari, U., Navarro, J., Reid, W., Seabroke, G., Steinmetz, M., & Watson, F. (2018). The local rotation curve of the Milky Way based on SEGUE and RAVE data. Astronomy and Astrophysics, 614, A63. https://doi.org/10.1051/0004-6361/201731143

• Journal Article Type: Article
• Acceptance Date: Feb 20, 2018
• Online Publication Date: Jun 13, 2018
• Publication Date: 2018-06
• Deposit Date: Jun 28, 2018
• Publicly Available Date: Jun 14, 2019
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 614
• Pages: A63
• DOI: https://doi.org/10.1051/0004-6361/201731143
• Keywords: Space and Planetary Science; Astronomy and Astrophysics
• Public URL: https://hull-repository.worktribe.com/output/899020
• Publisher URL: https://www.aanda.org/articles/aa/abs/2018/06/aa31143-17/aa31143-17.html
• Contract Date: Jun 28, 2018