Induced star formation and the origin of gamma-ray bursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

New arguments are presented in favor of the hypothesis that three giant stellar arcs and the LMC4 supershell in the Large Magellanic Cloud (LMC) are relicts of gamma-ray bursts (GRBs), whose progenitors escaped from the nearby old, rich star cluster NGC 1978. This may also be true of the binary X-ray sources concentrated in this same area and the object SNR N49-SGR 0526-66, located 18' from the cluster. All these objects may be genetically related to each other and to objects such as SN 1998bw-GRB 980425. The occurrence of five GRBs in the LMC over the last ~50 Myr is quite plausible. The rate of GRBs may be high, and they may be triggers for the formation of many HI supershells and regions of active star formation.

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