Constraining the Supernova Remnant Environment of FRB 190520B with Dispersion Measure and Scattering Timescale

@misc{wei2026constraining,
  title = {{Constraining the Supernova Remnant Environment of FRB 190520B with Dispersion Measure and Scattering Timescale}},
  author = {Jia-Peng Wei and Chen Deng and Gwenael Giacinti and Ze-Cheng Zou and Chen-Ran Hu and Yong-Feng Huang and Jin-Jun Geng},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.26553},
  eprint = {2605.26553},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.26553},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Constraining the Supernova Remnant Environment of FRB 190520B with Dispersion Measure and Scattering Timescale
AU  - Jia-Peng Wei
AU  - Chen Deng
AU  - Gwenael Giacinti
AU  - Ze-Cheng Zou
AU  - Chen-Ran Hu
AU  - Yong-Feng Huang
AU  - Jin-Jun Geng
PY  - 2026
DA  - 2026/09/06
PB  - arXiv
DO  - 10.48550/arxiv.2605.26553
UR  - https://arxiv.org/abs/2605.26553
AB  - FRB 190520B is a repeating fast radio burst source whose large dispersion measure (DM) and temporal broadening suggest a dense and evolving local environment. In this work, we test the possibility that FRB 190520B originates from the core-collapse of a massive star so that its central engine is embedded in a supernova remnant (SNR) expanding into a wind environment, whose evolution is described by the self-similar solution. We use the observed DM and scattering timescale of FRB 190520B to constrain the physical parameters of its surrounding SNR and host-galaxy DM. Twenty typical cases are considered, arising from four ejecta profiles and five scattering prescriptions. It is found that only 6 cases are retained and provide acceptable fits. All retained cases have a shallow ejecta profile and a young source age of t_0=79.8--169.8 yr. The ejecta mass is inferred to be large for all six cases, while the kinetic energy and mass-loss rate span a wide range. The secular DM evolution is reproduced better than the detailed scattering evolution. The up-drift behavior of the scattering residual suggests an additional component or more complicated structures inside the SNR. All retained cases are self-consistent within the adopted scattering theory and the circum-burst medium becomes transparent for GHz bursts before the inferred source ages.
ER  -