Constraining the Milky Way halo potential with the GD-1 stellar stream
Abstract
Abstract We use ESA/Gaia astrometry together with SEGUE and LAMOST measurements of the GD-1 stellar stream to explore the improvement on the Galactic gravitational potential that these new data provide. Assuming a realistic universal model for the dark matter halo together with reasonable models of the baryonic components, we find that the orbital solutions for GD-1 require the circular velocity at the Solar radius to be $$V_{\rm circ}({\rm R}_\odot) =244\pm 4{\rm \, km\, s^{-1}}$$, and also that the density flattening of the dark halo is $$q_{\rho }=0.82^{+0.25}_{-0.13}$$. The corresponding Galactic mass within $$20{\rm \, kpc}$$ was estimated to be $$M_{\rm MW}(\lt 20{\rm \, kpc})=2.5\pm 0.2 \times 10^{11} {\rm \, M_\odot }$$. Moreover, Gaia’s excellent proper motions also allowed us to constrain the velocity dispersion of the GD-1 stream in the direction tangential to the line of sight to be $$\lt 2.30{\rm \, km\, s^{-1}}$$ (95 per cent confidence limit), confirming the extremely cold dynamical nature of this system.
- Authors:
-
- The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova, SE-10691 Stockholm, Sweden, Université de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France
- Université de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1509493
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 486 Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Malhan, Khyati, and Ibata, Rodrigo A. Constraining the Milky Way halo potential with the GD-1 stellar stream. United Kingdom: N. p., 2019.
Web. doi:10.1093/mnras/stz1035.
Malhan, Khyati, & Ibata, Rodrigo A. Constraining the Milky Way halo potential with the GD-1 stellar stream. United Kingdom. https://doi.org/10.1093/mnras/stz1035
Malhan, Khyati, and Ibata, Rodrigo A. Sat .
"Constraining the Milky Way halo potential with the GD-1 stellar stream". United Kingdom. https://doi.org/10.1093/mnras/stz1035.
@article{osti_1509493,
title = {Constraining the Milky Way halo potential with the GD-1 stellar stream},
author = {Malhan, Khyati and Ibata, Rodrigo A.},
abstractNote = {Abstract We use ESA/Gaia astrometry together with SEGUE and LAMOST measurements of the GD-1 stellar stream to explore the improvement on the Galactic gravitational potential that these new data provide. Assuming a realistic universal model for the dark matter halo together with reasonable models of the baryonic components, we find that the orbital solutions for GD-1 require the circular velocity at the Solar radius to be $V_{\rm circ}({\rm R}_\odot) =244\pm 4{\rm \, km\, s^{-1}}$, and also that the density flattening of the dark halo is $q_{\rho }=0.82^{+0.25}_{-0.13}$. The corresponding Galactic mass within $20{\rm \, kpc}$ was estimated to be $M_{\rm MW}(\lt 20{\rm \, kpc})=2.5\pm 0.2 \times 10^{11} {\rm \, M_\odot }$. Moreover, Gaia’s excellent proper motions also allowed us to constrain the velocity dispersion of the GD-1 stream in the direction tangential to the line of sight to be $\lt 2.30{\rm \, km\, s^{-1}}$ (95 per cent confidence limit), confirming the extremely cold dynamical nature of this system.},
doi = {10.1093/mnras/stz1035},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 486,
place = {United Kingdom},
year = {Sat Apr 13 00:00:00 EDT 2019},
month = {Sat Apr 13 00:00:00 EDT 2019}
}
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