The inner cavity of the circumnuclear disc
Marvin Blank, Mark R. Morris, Adam Frank, Jonathan J., Carroll-Nellenback, Wolfgang J. Duschl

TL;DR
This study uses simulations to challenge existing ideas about the Galactic Centre's circumnuclear disc, showing magnetic fields stabilize the inner rim and that unstable clumps do not imply the disc's transience.
Contribution
It demonstrates that magnetic fields prevent rapid inward migration of the disc's inner rim and that unstable clumps are not necessarily indicative of a transient disc.
Findings
Inner cavity fills quickly without magnetic fields
Magnetic fields stabilize the inner rim
Unstable clumps do not imply disc transience
Abstract
The circumnuclear disc (CND) orbiting the Galaxy's central black hole is a reservoir of material that can ultimately provide energy through accretion, or form stars in the presence of the black hole, as evidenced by the stellar cluster that is presently located at the CND's centre. In this paper, we report the results of a computational study of the dynamics of the CND. The results lead us to question two paradigms that are prevalent in previous research on the Galactic Centre. The first is that the disc's inner cavity is maintained by the interaction of the central stellar cluster's strong winds with the disc's inner rim, and second, that the presence of unstable clumps in the disc implies that the CND is a transient feature. Our simulations show that, in the absence of a magnetic field, the interaction of the wind with the inner disc rim actually leads to a filling of the inner cavity…
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