MHD shock waves through a galactic nuclear disk with a vertical magnetic field.
Abstract
Effects of a vertical magnetic field on the propagation of shock waves originating from the center of the nuclear disk in galaxies are examined by using a two-dimensional MHD code. A single adiabatic explosion is assumed to occur in the center of a pressureless gas disk with a uniform magnetic field penetrating the disk perpendicularly, and the presence of a low density gaseous halo is assumed. For a moderate field strength a flow with a hollow cylindrical shell structure appears with the shell surface being a contact surface of the mass ejected from the disk due to the shock propagation. For a higher field strength the mass motion is highly collimated and produces a jet with a narrow opening angle along vertical field lines. The hollow shell structure in the former case resembles the shapes of the radio lobes found in our galactic center and in M82. The well-collimated jet in the latter case may be similar to radio jets ejected from more active galactic nuclei.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- 1988
- Bibcode:
- 1988PASJ...40...25U
- Keywords:
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- Galactic Nuclei;
- Interstellar Magnetic Fields;
- Magnetohydrodynamic Waves;
- Shock Wave Propagation;
- Magnetic Field Configurations;
- Magnetic Flux;
- Astrophysics