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http://dx.doi.org/10.5303/JKAS.2020.53.6.117

MECHANISM INDUCING GAS SUPPLY TO THE CENTRAL 10 PARSEC OF THE MILKY WAY  

Morgan, Hannah L. (School of Space Research, Kyung Hee University)
Kim, Sungsoo S. (School of Space Research, Kyung Hee University)
Shin, Jihye (Korea Astronomy and Space Science Institute)
Chun, Kyungwon (School of Space Research, Kyung Hee University)
Park, So-Myoung (School of Space Research, Kyung Hee University)
Lee, Joowon (School of Space Research, Kyung Hee University)
Minh, Young Chol (Korea Astronomy and Space Science Institute)
Publication Information
Journal of The Korean Astronomical Society / v.53, no.6, 2020 , pp. 117-123 More about this Journal
Abstract
We investigate the plausibility of mass return, from stellar mass loss processes within the central ~100 pc region of the Milky Way (the inner nuclear bulge), as a mass supply mechanism for the Circumnuclear Disk (CND). Gas in the Galactic disk migrates inward to the Galactic centre due to the asymmetric potential caused by the Galactic bar. The inward migration of gas stops and accumulates to form the central molecular zone (CMZ), at 100-200 pc from the Galactic center. It is commonly assumed that stars have formed in the CMZ throughout the lifetime of the Galaxy and have diffused inward to form a 'r-2 stellar cusp' within the inner nuclear bulge. We propose that the stars migrating inward from the CMZ supply gas to the inner nuclear bulge via stellar mass loss, resulting in the formation of a gas disk along the Galactic plane and subsequent inward migration down to the central 10 pc region (CND). We simulate the evolution of a gas distribution that initially follows the stellar distribution of the aforementioned stellar cusp, and illustrate the potential gas supply toward the CND.
Keywords
Galaxy: center; Galaxy: nucleus; Galaxy: local interstellar matter; Galaxy: evolution;
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