Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray Bursts
The afterglow of gamma-ray bursts (GRBs) has been extensively discussed in the context of shocks generated during an interaction of relativistic outflows with their ambient medium. This process leads to the formation of both a forward and a reverse shock. While the emission from the forward shock, o...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9007 |
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| author | Sen-Lin Pang Zi-Gao Dai |
| author_facet | Sen-Lin Pang Zi-Gao Dai |
| author_sort | Sen-Lin Pang |
| collection | DOAJ |
| description | The afterglow of gamma-ray bursts (GRBs) has been extensively discussed in the context of shocks generated during an interaction of relativistic outflows with their ambient medium. This process leads to the formation of both a forward and a reverse shock. While the emission from the forward shock, observed off-axis, has been well-studied as a potential electromagnetic counterpart to a gravitational-wave-detected merger, the contribution of the reverse shock is commonly overlooked. In this paper, we investigate the contribution of the reverse shock to the GRB afterglows observed off-axis. In our analysis, we consider jets with different angular profiles, including two-component jets, power-law structured jets, Gaussian jets, and “mixed jets” featuring a Poynting-flux-dominated core surrounded by a baryonic wing. We apply our model to GRB 170817A/GW170817 and employ the Markov Chain Monte Carlo method to obtain model parameters. Our findings suggest that the reverse shock emission can significantly contribute to the early afterglow. In addition, our calculations indicate that the light curves observable in future off-axis GRBs may exhibit either double peaks or a single peak with a prominent feature, depending on the jet structure, viewing angle, and microphysics shock parameters. |
| format | Article |
| id | doaj-art-6fcd6043cf98473d9e89c94bcfb52497 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-6fcd6043cf98473d9e89c94bcfb524972025-08-20T01:55:15ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01977112310.3847/1538-4357/ad9007Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray BurstsSen-Lin Pang0https://orcid.org/0009-0002-0137-2650Zi-Gao Dai1https://orcid.org/0000-0002-7835-8585Department of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China ; daizg@ustc.edu.cnDepartment of Astronomy, University of Science and Technology of China , Hefei 230026, People's Republic of China ; daizg@ustc.edu.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People's Republic of ChinaThe afterglow of gamma-ray bursts (GRBs) has been extensively discussed in the context of shocks generated during an interaction of relativistic outflows with their ambient medium. This process leads to the formation of both a forward and a reverse shock. While the emission from the forward shock, observed off-axis, has been well-studied as a potential electromagnetic counterpart to a gravitational-wave-detected merger, the contribution of the reverse shock is commonly overlooked. In this paper, we investigate the contribution of the reverse shock to the GRB afterglows observed off-axis. In our analysis, we consider jets with different angular profiles, including two-component jets, power-law structured jets, Gaussian jets, and “mixed jets” featuring a Poynting-flux-dominated core surrounded by a baryonic wing. We apply our model to GRB 170817A/GW170817 and employ the Markov Chain Monte Carlo method to obtain model parameters. Our findings suggest that the reverse shock emission can significantly contribute to the early afterglow. In addition, our calculations indicate that the light curves observable in future off-axis GRBs may exhibit either double peaks or a single peak with a prominent feature, depending on the jet structure, viewing angle, and microphysics shock parameters.https://doi.org/10.3847/1538-4357/ad9007Gamma-ray burstsRelativistic jetsNon-thermal radiation sources |
| spellingShingle | Sen-Lin Pang Zi-Gao Dai Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray Bursts The Astrophysical Journal Gamma-ray bursts Relativistic jets Non-thermal radiation sources |
| title | Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray Bursts |
| title_full | Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray Bursts |
| title_fullStr | Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray Bursts |
| title_full_unstemmed | Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray Bursts |
| title_short | Reverse Shock Emission from Misaligned Structured Jets in Gamma-Ray Bursts |
| title_sort | reverse shock emission from misaligned structured jets in gamma ray bursts |
| topic | Gamma-ray bursts Relativistic jets Non-thermal radiation sources |
| url | https://doi.org/10.3847/1538-4357/ad9007 |
| work_keys_str_mv | AT senlinpang reverseshockemissionfrommisalignedstructuredjetsingammaraybursts AT zigaodai reverseshockemissionfrommisalignedstructuredjetsingammaraybursts |