Abstract
In this paper we carry out a semi-analytic general relativistic study of a Gamma-Ray Bursts (GRB) jet that is breaking out of a cocoon or stellar envelope. We solve hydrodynamic equations with the relativistic equation of state that takes care of fluid composition. In short GRBs, a general relativistic approach is required to account for curved spacetime in strong gravity. The piercing of the jet through the cocoon resembles a de Laval nozzle and the jet may go through recollimation shock transitions. We show that the possibility of shock transition and the shock properties are sensitive to the matter composition and the cocoon strength. Obtained Lorentz factors in thermally driven jets comfortably reach few ×10.
Original language | English |
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Article number | 294 |
Journal | Universe |
Volume | 8 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2022 |
Bibliographical note
Publisher Copyright:© 2022 by the author. Licensee MDPI, Basel, Switzerland.
Funding
Acknowledgments: I am thankful to the anonymous reviewers who helped in clarifying various aspects of the study and I am grateful to Asaf Pe’er for an insightful discussion and important suggestions. I further acknowledge the support from Israel government’s PBC program and the European Union (EU) via ERC consolidator grant 773062 (O.M.J.)
Funders | Funder number |
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European Commission | |
European Commission | 773062 |
Keywords
- Fermi acceleration
- astrophysical shocks
- gamma ray bursts
- high energy astrophysics
- relativistic hydrodynamics
- theoretical models