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Constraining the Milky Way halo potential with the GD-1 stellar stream

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 circ (R) = 244 ± 4 km s −1 , and also that the density flattening of the dark halo is q ρ = 0.82 +0.25 −0.13. The corresponding Galactic mass within 20 kpc was estimated to be M MW (< 20 kpc) = 2.5 ± 0.2 × 10 11 M. 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 < 2.30 km s −1 (95% confidence limit), confirming the extremely cold dynamical nature of this system.
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https://hal.archives-ouvertes.fr/hal-02400842
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Submitted on : Monday, December 9, 2019 - 4:40:44 PM
Last modification on : Wednesday, November 3, 2021 - 5:26:30 AM
Long-term archiving on: : Tuesday, March 10, 2020 - 11:06:17 PM

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Khyati Malhan, Rodrigo Ibata. Constraining the Milky Way halo potential with the GD-1 stellar stream. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2019, 486 (3), pp.2995-3005. ⟨10.1093/mnras/stz1035⟩. ⟨hal-02400842⟩

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