Mon. Not. R. Astron. Soc., 499, 4455-4478 (2020/December-2)
Simulations of the Milky Way's central molecular zone - I. Gas dynamics.
TRESS R.G., SORMANI M.C., GLOVER S.C.O., KLESSEN R.S., BATTERSBY C.D., CLARK P.C., HATCHFIELD H.P. and SMITH R.J.
Abstract (from CDS):
We use hydrodynamical simulations to study the Milky Way's central molecular zone (CMZ). The simulations include a non-equilibrium chemical network, the gas self-gravity, star formation, and supernova feedback. We resolve the structure of the interstellar medium at sub-parsec resolution while also capturing the interaction between the CMZ and the bar-driven large-scale flow out to R∼5 kpc. Our main findings are as follows: (1) The distinction between inner (R <= 120 pc) and outer (120 <= R <= 450 pc) CMZ that is sometimes proposed in the literature is unnecessary. Instead, the CMZ is best described as single structure, namely a star-forming ring with outer radius R ≃ 200 pc which includes the 1.3° complex and which is directly interacting with the dust lanes that mediate the bar-driven inflow. (2) This accretion can induce a significant tilt of the CMZ out of the plane. A tilted CMZ might provide an alternative explanation to the ∞-shaped structure identified in Herschel data by Molinari et al. (3) The bar in our simulation efficiently drives an inflow from the Galactic disc (R ≃ 3 kpc) down to the CMZ (R ≃ 200 pc) of the order of 1 M☉yr–1, consistent with observational determinations. (4) Supernova feedback can drive an inflow from the CMZ inwards towards the circumnuclear disc of the order of ∼0.03 M☉yr–1. (5) We give a new interpretation for the 3D placement of the 20 and 50 km s–1 clouds, according to which they are close (R <= 30 pc) to the Galactic Centre, but are also connected to the larger scale streams at R >= 100 pc.
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
stars: formation - ISM: clouds - ISM: evolution - ISM: kinematics and dynamics - Galaxy: centre - Galaxy: kinematics and dynamics
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