Galactic Centre Threads as Nuclear MHD Waves

Abstract

Propagation of fast-mode magnetohydrodynamic (MHD) compression waves is traced in the Galactic Center with a poloidal magnetic cylinder. MHD waves ejected from the nucleus are reflected and guided along the magnetic field, exhibiting vertically stretched fronts. The radio threads and non-thermal filaments are explained as due to tangential views of the waves driven by sporadic activity in Sgr A${}^{\ast }$, or by multiple supernovae. In the latter case, the threads could be extremely deformed relics of old SNRs exploded in the nucleus.

6 pages, 8 figures, PASJ Letters in press

References in corpus (3)

• The Galactic Centre Chimney
• X-ray Observation of a Magnetized Hot Gas Outflow in the Galactic Center Region
• The Galactic Center Lobe Filled with Thermal Plasma

Cited by in corpus (11)

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• A Unified Model for the Fan Region and the North Polar Spur: A bundle of filaments in the Local Galaxy
• A Supernova-driven, Magnetically-collimated Outflow as the Origin of the Galactic Center Radio Bubbles
• Populations of Magnetized Filaments in the Intracluster Medium and the Galactic Center
• Chandra large-scale mapping of the Galactic center: Probing high-energy structures around the central molecular zone
• Statistical Properties of the Population of the Galactic Center Filaments II: The Spacing Between Filaments
• Supernova-remnant origin of the Galactic-Centre filaments
• A VLA Study of Newly-Discovered Southern Latitude Non-Thermal Filaments in the Galactic Center: Radio Continuum Total-intensity and Spectral Index Properties
• Discovery of a filamentary synchrotron structure connected to the coherent magnetic field in the outer Galaxy
• Feedback between Sgr A and B : AGN-Starburst Connection in the Galactic Centre