Fast radio bursts generated by coherent curvature radiation from compressed bunches for FRB 20190520B

• 作者： Xiang-han Cui ¹ Zheng-wu Wang ¹ Cheng-min Zhang ¹ Chen-hui Niu ² Di Li ¹ Jian-wei Zhang ¹ De-hua Wang ³
• 作者单位：
  1.  CAS Key Lab of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China

  2.  Institute of Astrophysics, Central China Normal University, Wuhan 430079, China

  3.  School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China
• 提交时间：2023-08-31

摘要: The radiation mechanism of fast radio bursts (FRBs) has been extensively studied but still remains elusive. Coherent radiation is identified as a crucial component in the FRB mechanism, with charged bunches also playing a significant role under specific circumstances. In the present research, we propose a phenomenological model that draws upon the coherent curvature radiation framework and the magnetized neutron star, taking into account the kinetic energy losses of outflow particles due to inverse Compton scattering (ICS) induced by soft photons within the magnetosphere. By integrating the ICS deceleration mechanism for particles, we hypothesize a potential compression effect on the particle number density within a magnetic tube/family, which could facilitate achieving the necessary size for coherent radiation in the radial direction. This mechanism might potentially enable the dynamic formation of bunches capable of emitting coherent curvature radiation along the curved magnetic field. Moreover, we examine the formation of bunches from an energy perspective. Our discussion suggests that within the given parameter space the formation of bunches is feasible. Finally, we apply this model to FRB 20190520B, one of the most active repeating FRBs discovered and monitored by FAST. Several observed phenomena are explained, including basic characteristics, frequency downward drifting, and bright spots within certain dynamic spectral ranges.

• 来自： 崔翔翰
• 分类： 天文学 >> 天体物理学 天文学 >> 天文学
• 说明： 16 pages, 9 figures, and 1 table. Accepted for publication in ApJ
• 投稿状态： 已被期刊接收
• 引用： ChinaXiv:202309.00036 (或此版本 ChinaXiv:202309.00036V1)
  DOI:10.12074/202309.00036V1
  CSTR:32003.36.ChinaXiv.202309.00036.V1
• 推荐引用方式： Xiang-han Cui,Zheng-wu Wang,Cheng-min Zhang,Chen-hui Niu,Di Li,Jian-wei Zhang,De-hua Wang.(2023).Fast radio bursts generated by coherent curvature radiation from compressed bunches for FRB 20190520B.null.doi:10.12074/202309.00036V1 (点此复制)