We present the scintillation velocity measurements of FRB~20201124A from the FAST observations, which reveal an annual variation. This annual variation is further supported by changes detected in the scintillation arc as observed from the secondary spectrum. We attribute the annual velocity variation to the presence of a moderately anisotropic scattering screen located at a distance of 0.4±0.1~kpc from Earth. Our results prove that the scintillation of this FRB is mainly caused by material close to Earth on a Galactic scale. However, scintillation observations of other FRBs may expose their surrounding environment or uncover possible orbital motion if scintillation is caused by materials in their host galaxy.
@article{arxiv.2406.12218,
title = {Scintillation velocity and arc observations of FRB 20201124A},
author = {Ziwei Wu and Weiwei Zhu and Bing Zhang and Yi Feng and JinLin Han and Di Li and Dongzi Li and Rui Luo and Chenhui Niu and Jiarui Niu and Bojun Wang and Fayin Wang and Pei Wang and Weiyang Wang and Heng Xu and Yuanpei Yang and Yongkun Zhang and Dejiang Zhou and Yuhao Zhu and Can-Min Deng and Yonghua Xu},
journal= {arXiv preprint arXiv:2406.12218},
year = {2024}
}
Comments
4 figures, 1 tables, accepted for publication in ApJL