천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제43권1호
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- Pages.39.1-39.1
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- 2018
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- 1226-2692(pISSN)
Physical mechanism of gamma-ray bursts: recent breakthroughs
- 엄정휘 ;
- ;
- Uhm, Z. Lucas (Astrophysics Science Division, NASA Goddard Space Flight Center) ;
- Zhang, Bing (Department of Physics and Astronomy, University of Nevada - Las Vega) ;
- Racusin, Judith (Astrophysics Science Division, NASA Goddard Space Flight Center)
- 발행 : 2018.05.08
초록
Although it is agreed that the gamma-ray bursts (GRBs) invoke highly relativistic jets with bulk Lorentz factors of a few hundreds, the exact physical mechanism producing such powerful gamma-rays still remains debated. Three outstanding and important questions in the field concern (1) the composition of GRB jets (i.e., matter-dominated vs Poynting-flux-dominated), (2) the involved radiative process responsible for the observed gamma-rays (i.e., synchrotron mechanism vs photospheric radiation), and (3) the distance of the emitting region from the central engine where the prompt gamma-rays are released (i.e., ~10^12 cm vs 10^14 cm vs 10^16 cm). I will present recent important breakthroughs that we have made, which answer these three questions.
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