The evolution of a magnetized superbubble

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bubbles, Interstellar Magnetic Fields, Magnetohydrodynamics, Supernovae, Astronomical Models, Interstellar Matter

Scientific paper

Superbubbles expanding in a magnetized interstellar matter were studied using a 2D axisymmetric magnetohydrodynamics code. A superbubble, which is formed by sequential supernova explosions in an OB association, appears to be spherical in its early evolution phase. The hot matter ejected from supernovae is surrounded by a shell, which comprises swept-up interstellar matter and magnetic fields. When the magnetic energy contained in a superbubble becomes nonnegligible, compared with the driving thermal energy, the bubble begins to expand mainly in the direction parallel to the magnetic field. The structure at this stage is much different from that of a nonmagnetic superbubble, e.g., the shell expanding perpendicular to the magnetic field is thick, which is supported by the magnetic field. In a late phase, the expansion perpendicular to the magnetic field stops, and the bubble expands in one dimension. There exists a critical supernova rate above which the superbubble can punch out the galactic gas disk.

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