We present the interstellar scintillation analysis of fast radio burst (FRB) 20220912A during its extremely active episode in 2022 using data from the Five-hundred-meter Aperture Spherical Radio Telescope (FAST). We detect a scintillation arc in the FRB's secondary spectrum, which describes the power in terms of the scattered FRB signals' time delay and Doppler shift. The arc indicates that the scintillation is caused by a highly localized region of the ionized interstellar medium (IISM). Our analysis favors a Milky Way origin for the localized scattering medium but cannot rule out a host galaxy origin. We present our method for detecting the scintillation arc, which can be applied generally to sources with irregularly spaced bursts or pulses. These methods could help shed light on the complex interstellar environment surrounding the FRBs and in our Galaxy.
@article{arxiv.2304.14697,
title = {Scintillation Arc from FRB 20220912A},
author = {Zi-Wei Wu and Robert A. Main and Wei-Wei Zhu and Bing Zhang and Peng Jiang and Jia-Rui Niu and Jin-Lin Han and Di Li and Ke-Jia Lee and Dong-Zi Li and Yuan-Pei Yang and Fa-Yin Wang and Rui Luo and Pei Wang and Chen-Hui Niu and Heng Xu and Bo-Jun Wang and Wei-Yang Wang and Yong-Kun Zhang and Yi Feng and De-Jiang Zhou and Yong-Hua Xu and Can-Min Deng and Yu-Hao Zhu},
journal= {arXiv preprint arXiv:2304.14697},
year = {2023}
}