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Paper: Gas Flows Toward the Central Molecular Zone
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 57
Authors: Ott, J.; Meier, D. S.; Gramze, S.; Candelaria, T.; team SWAG
Abstract: The dust lanes in the bar of the Milky Way are thought to define the pathways where gas is fed to the Central Molecular Zone. We attempt to identify the feeding gas and to derive its properties along the cloud trajectories. We find a warm gas phase that is likely part of the inflow. The gas shows two point-symmetric clouds, G5 and Bania 1. Despite their positional symmetry, however, these clouds are likely at different galactocentric radii and undergo different physical effects: overshooting dust lane gas for G5 and gas along the western dust lane for Bania 1. The gas is subject to shocks of different strengths on its way to the accretion point on the 100 pc ring near Sgr B2. This is the gas that can be found near the l=1.4° region, gas that shows very diverse dynamic, thermodynamic, and shock states, but is barely influenced by the star formation in the region. We find that the initially injected, low excitation disk gas is energized along the dust lanes and accretes on the 100 pc ring in a state that is already very similar to the gas within the Central Molecular Zone.
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