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Astron. Astrophys. 350, 457-468 (1999)


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Gamma ray bursts versus OB associations: do they trigger star formation?

Yu.N. Efremov 1, S. Ehlerová 2 and J. Palou 2

1 Sternberg Astronomical Institute, MSU, 119899 Moscow, Russia
2 Astronomical Institute, Academy of Sciences of the Czech Republic, Bon II 1401, 141 31 Prague 4, Czech Republic

Received 11 March 1999 / Accepted 13 July 1999

Abstract

We discuss differences in shapes, expansion velocities and fragmentation times of structures created by an energy deposition from a single Gamma-Ray Burst (GRB) and an OB association to the ISM. After the initial inflation, supershells produced by GRBs are almost static or slowly expanding, contrary to more rapidly expanding supershells created by OB associations. We discuss the position of the energy source relative to the symmetry plane of the galaxy: observed arc-like structures can be the most dense part of structures formed by an expansion from a source above or below the galactic plane. Arcs may also form if the expansion takes place inside a giant HI cloud. We try to reproduce the size, the age, and the average distance between OB associations in the Sextant region at the edge of LMC 4.

Key words: gamma rays: bursts – galaxies: star clusters – galaxies: individual: LMC – ISM: supernova remnants – ISM: bubbles – stars: formation

Send offprint requests to: J. Palou (palous@ig.cas.cz)

© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999

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