The most distant optically polarised GRB afterglow: GRB 240419A at z = 5.178
文献类型：期刊论文
| 作者 | Brivio, R.32; Covino, S.31,32; Ferro, M.32; Saccardi, A.2; Martin-Carrillo, A.30; Kuwata, A.28,29; Toma, K.28,29; D’Avanzo, P.32; Hu, Y.-D.27,32; Izzo, L.25,26 |
| 刊名 | Astronomy and Astrophysics
 |
| 出版日期 | 2025-11-01 |
| 卷号 | 703 |
| 关键词 | polarization gamma-ray burst: general gamma-ray burst: individual: GRB 240419A |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202555757 |
| 产权排序 | 第24完成单位 |
| 文献子类 | Journal article (JA) - |
| 英文摘要 | Context. Gamma-ray bursts (GRBs) are extremely bright phenomena powered by relativistic jets arising from explosive events at cosmological distances. The nature of the jet and the configuration of the local magnetic fields are still unclear, with the distinction between different models possibly provided by the detection of early-time polarisation. Aims. Past observations do not agree on a universal scenario describing early-time polarisation in GRB afterglows, and new studies are necessary to investigate this open question. We present here the discovery of GRB 240419A, its redshift determination of z = 5.178, its early-time optical polarimetry observations, and the multi-wavelength monitoring of its afterglow. Methods. We analysed three epochs of polarimetric data to derive the early-time evolution of the polarisation. The multi-wavelength light curve from the X-rays to the near-infrared band was also investigated to give a broader perspective on the whole event. Results. We find a high level of polarisation, P = 6.97+1.84−1.52%, at 1740 s after the GRB trigger, followed by a slight decrease up to P = 4.81+1.87−1.53% at 3059 s. On the same timescale, the polarisation position angle is nearly constant. The multi-band afterglow at the time of the polarisation measurements is consistent with a forward shock (FS), while the earlier evolution at t − t0 700 s can be associated with the interplay between the forward and the reverse shocks or with energy injection. Conclusions. The detected polarised radiation when the afterglow is FS-dominated and the stable position angle are consistent with an ordered magnetic field plus a turbulent component driven by large-scale magnetohydrodynamic instabilities. The lack of a jet break in the light curve prevents a comparison of the polarisation temporal evolution with theoretical expectations from magnetic fields amplified by microscopic-scale turbulence, limiting our ability to constrain the observer’s viewing angle. Notably, GRB 240419A is the most distant GRB with a detected polarised optical afterglow, extending the redshift range for such measurements. © The Authors 2025. |
| 学科主题 | 天文学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE |
| WOS关键词 | GAMMA-RAY BURST ; REVERSE SHOCK EMISSION ; MAGNETIC-FIELD ; LIGHT CURVES ; LINEAR-POLARIZATION ; ENERGY INJECTION ; SYNCHROTRON POLARIZATION ; RELATIVISTIC SHOCK ; WEIBEL INSTABILITY ; INTERNAL SHOCKS |
| 资助项目 | N/A |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001609664600005 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | [I/004/11/6] ; [20179ZF5KS] ; [12393813] ; [VIL6086] ; [MR/T020784/1] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28731]  |
| 专题 | 星系类星体研究组 |
| 通讯作者 | Brivio, R. |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China; 2.Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM, Gif-sur-Yvette, 91191, France; 3.School of Mathematical and Physical Sciences, Macquarie University, NSW 2109, Sydney, Australia 4.School of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom; 5.Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, United States; 6.Aix Marseille University, CNRS, CNES, LAM, Marseille, France; 7.INAF, IASF Milano, Via Alfonso Corti 12, Milano, 20133, Italy; 8.INAF, Osservatorio di Astrofisica e Scienza dello Spazio, Via Piero Gobetti 93/3, Bologna, 40129, Italy; 9.Anton Pannekoek Institute for Astronomy, University of Amsterdam, P.O. Box 94249, Amsterdam, 1090 GE, Netherlands; 10.INAF, Osservatorio Astronomico di Roma, Via Frascati 33, Monte Porzio Catone, 00078, Italy; |
| 推荐引用方式 GB/T 7714 | Brivio, R.,Covino, S.,Ferro, M.,et al. The most distant optically polarised GRB afterglow: GRB 240419A at z = 5.178[J]. Astronomy and Astrophysics,2025,703. |
| APA | Brivio, R..,Covino, S..,Ferro, M..,Saccardi, A..,Martin-Carrillo, A..,...&Zafar, T..(2025).The most distant optically polarised GRB afterglow: GRB 240419A at z = 5.178.Astronomy and Astrophysics,703. |
| MLA | Brivio, R.,et al."The most distant optically polarised GRB afterglow: GRB 240419A at z = 5.178".Astronomy and Astrophysics 703(2025). |
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