Mass Supply to Galactic Center due to Nested Bars in the Galaxy

Abstract

We investigate rapid mass supply process by nested bars in the Galaxy by numerical simulation. We simulate gas flow in the whole galaxy disk with nested bars, which are the outer bar and the inner bar, especially with highly spatial resolution in the galactic central region. We assume two cases of inner bar size which are a smaller one and a larger one than the radius of the 200 pc gas ring which is corresponds to the Central Molecular Zone. From our numerical results, in the large size bar cases, the inner bars with large elongation induce sufficient mass inflow and destroy the 200 pc gas ring. On the other hand, in the small size bar cases, the inner bars with large elongation induce large mass inflow and do not destroy the 200 pc gas ring. This mass inflow is caused by straight shocks excited by the inner bar. In this case, nuclear gas disks of ~ 15 pc radius are formed. The nuclear gas disks are self-gravitationally unstable and we expect formation of compact star clusters under strong tidal force in the nuclear gas disks. We discuss evolution of the nuclear gas disk.

36 pages, 11 figures. Submitted to ApJ

References in corpus (10)

• Modelling the Galactic bar using OGLE-II Red Clump Giant Stars
• Streaming Motions Towards the Supermassive Black Hole in NGC 1097
• Molecular Gas Dynamics in NGC 6946: a Bar-driven Nuclear Starburst "Caught in the Act"
• A CO J=3-2 Survey of the Galactic Center
• Long-Lived Double-Barred Galaxies From Pseudo-Bulges
• Induced Nested Galactic Bars Inside Assembling Dark Matter Halos
• Coupling the dynamics and the molecular chemistry in the Galactic center
• Nuclear Bar Catalyzed Star Formation: 13^CO, C18^O and Molecular Gas Properties in the Nucleus of Maffei 2
• Bar-Driven Mass Build-Up within the Central 50pc of NGC6946
• A Complete Survey of the Central Molecular Zone in NH3

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