The refill of superbubble cavities

Free access article

Issue		A&A Volume 445, Number 3, January III 2006


Page(s)		L39 - L42
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200500220

A&A 445, L39-L42 (2006)
DOI: 10.1051/0004-6361:200500220

Letter

The refill of superbubble cavities

S. Recchi and G. Hensler

Institute of Astronomy, Vienna University, Türkenschanzstrasse 17, 1180 Vienna, Austria
e-mail: [recchi;hensler]@astro.univie.ac.at

(Received 17 October 2005 / Accepted 21 November 2005)

Abstract
In this paper we study the late evolution of model galaxies after a single episode of star formation of different durations. The aim of the paper is to discover the timescale needed to refill with cold gas the center of the galaxy. This timescale strongly depends on the amount of gas initially present inside the galaxy and ranges between 125 and 600 Myr. A H I hole can therefore survive several hundred Myr after the last SNII has exploded. If, as a consequence of the refill of the center of the galaxy, a second episode of star formation occurs, it pollutes the surrounding medium in a very short timescale (of the order of 10-15 Myr), at variance with what happens if the center of the galaxy is still occupied by hot and tenuous gas.

Key words: hydrodynamics -- ISM: abundances -- ISM: bubbles -- ISM: jets and outflows -- galaxies: evolution

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