Long gamma-ray bursts and the morphology of their host galaxies |
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Authors: | A I Bogomazov V M Lipunov A V Tutukov |
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Institution: | (1) Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia;(2) Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia |
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Abstract: | We present the results of population syntheses for binary stars carried out using the “Scenario Machine” code with the aim of analyzing events that may result in long gamma-ray bursts. We show that the observed distribution of morphological types of the host galaxies of long gamma-ray bursts can be explained in a model in which long gamma-ray bursts result from the core collapse of massive Wolf-Rayet stars in close binaries. The dependence of the burst rate on galaxy type is associated with an increase in the rate of stellar-wind mass-loss with increasing stellar metallicity. The separation of binary components at the end of their evolution increases with the stellar-wind rate, resulting in a reduction of the number of binaries that produce gamma-bursts. |
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