Long gamma ray burst rate in the binary merger progenitor model
arXiv:1706.07692 · doi:10.3847/2041-8213/aa95bb
Abstract
The long gamma ray bursts (GRBs) may arise from the core collapse of massive stars. However, the long GRB rate does not follow the star formation rate (SFR) at high redshifts. In this Letter, we focus on the binary merger model and consider the high spin helium stars after the merger as the progenitor of long GRBs. With this scenario, we estimate the GRB rate by the population synthesis method with the metallicity evolution. Low metallicity binaries are easier to become long GRB progenitors than those for solar metallicity due to the weak wind mass loss and the difference in the stellar evolution. In our results, the long GRB rate roughly agrees with the observed rate, and shows a similar behavior to the observed redshift evolution.
accepted to ApJ Letters, comments welcome
References in corpus (6)
- Cosmic Star Formation History
- Binary interaction dominates the evolution of massive stars
- Binary star progenitors of long gamma-ray bursts
- Gamma-Ray Bursts from tidally spun-up Wolf-Rayet stars?
- Double-core evolution and the formation of neutron-star binaries with compact companions
- Perspectives on Gamma-Ray Burst Physics and Cosmology with Next Generation Facilities