Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.220..115k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 220, no. 1, p. 115-129
Astronomy and Astrophysics
Astrophysics
4
Astronomical Models, Interstellar Gas, Mass Flow, Nonlinear Feedback, Star Formation Rate, Starburst Galaxies, Galactic Evolution, Galactic Halos, Massive Stars, Molecular Clouds, Oscillations
Scientific paper
It is well known that galaxies accumulating large quantities of gas undergo violent bursts of star formation. This is believed to be due to tidal interactions of galaxies leading to the infall of gas into their central regions. Bursts of star formation in this scenario are transitory phenomena and can be induced only by external sources. However, in some cases there is no direct evidence of tidal interactions in starburst galaxies. We discuss another possibility of bursting phenomena in galaxies connected with nonlinear feedback processes in mass-exchange between components of a star-forming region. We consider a three-component model including cold clouds, warm gas and massive stars and take into account the delay processes in the transformation of hot gas ejected by massive stars and evaporated from cold phase, into the warm phase. Self-regulating mechanism of phase transition of small clouds into warm gas due to heating radiation of massive stars is also taken into account. The analysis of stability of the system shows that it could be unstable even in the case of a small efficiency in the birth of massive stars. The evolution of unstable nonlinear perturbations leads to the development of self-sustained nonlinear oscillations of star formation.
Korchagin Vladimir I.
Ryabtsev A. D.
Vorobyov Eduard I.
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