A Schwarzschild model of the Galactic bar with initial density from N-body simulations

Abstract

Using the potential from N-body simulations, we construct the Galactic bar models with the Schwarzschild method. By varying the pattern speed and the position angle of the bar, we find that the best-fit bar model has pattern speed ${\Omega }_{\mathrm{p}}=40\mathrm{km}{\mathrm{s}}^{-1}\mathrm{kp}{\mathrm{c}}^{-1}$, and bar angle ${\theta }_{\mathrm{bar}}=45^{\circ }$. $N$-body simulations show that the best-fit model is stable for more than 1.5 Gyrs. Combined with the results in Wang et al. (2012), we find that the bar angle and/or the pattern speed are not well constrained by BRAVA data in our Schwarzschild models. The proper motions predicted from our model are slightly larger than those observed in four fields. In the future, more kinematic data from the ground and space-based observations will enable us to refine our model of the Milky Way bar.

10 pages, 7 figures, 2 tables. Accepted for publication in MNRAS

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• Spending too much time at the Galactic bar: chaotic fanning of the Ophiuchus stream
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• Evaluating the ability of triaxial Schwarzschild modelling to estimate properties of galaxies from the Illustris simulation
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• Orbit-Superposition Dynamical Modeling of Barred Galaxies
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• Theoretical Models of the Galactic Bulge
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• Lopsidedness of self-consistent galaxies by the external field effect of clusters
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• Rediscovering the Milky Way with orbit superposition approach and APOGEE data I. Method validation
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• Dynamical Models of the Milky Way in Action Space with LAMOST DR8 and GAIA EDR3
• Deprojection of external barred galaxies from photometry