Journal Article

Evolution of superbubbles in a self-gravitating disc

L. Zaninetti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 3, pages 2343-2351
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI:
Evolution of superbubbles in a self-gravitating disc

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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 disc. A precise comparison with the results of numerical hydrodynamics 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.

Keywords: ISM: bubbles; ISM: clouds; Galaxy: disc; galaxies: starburst

Journal Article.  5181 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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