Evolution of superbubbles in a self-gravitating disk

TL;DR

This paper models the expansion of superbubbles in a self-gravitating disk using analytical and numerical methods, comparing results and applying the model to observed galactic structures like worms, considering galactic rotation effects.

Contribution

It introduces a combined analytical and numerical approach to superbubble evolution in a self-gravitating disk, including galaxy rotation effects and astrophysical applications.

Findings

Analytical and numerical results show good agreement.

Model explains observed limb-brightening in galactic worms.

Rotation influences superbubble radius and velocity evolution.

Abstract

The expansion of a superbubble is investigated both analytically and numerically. Our model implements the thin layer approximation in a vertical profile of density as given by an isothermal self-gravitating disk. A precise comparison with the results of numerical hydro-dynamics is given. Analogies are drawn with the Kompaneets equation that includes the quadratic hyperbolic-secant law in the list of the plane-parallel stratified media. An astrophysical application is made to the superbubble connected with the two worms 46.4+5.5 and 39.7+5.7. The effects of the rotation of the galaxy on the simulated radius and on the velocity are introduced. The worms with their strong limb-brightening visible on astronomical maps are explained in the framework of image theory.