Scintillation velocity and arc observations of FRB 20201124A
Ziwei Wu, Weiwei Zhu, Bing Zhang, Yi Feng, JinLin Han, Di Li, Dongzi, Li, Rui Luo, Chenhui Niu, Jiarui Niu, Bojun Wang, Fayin Wang, Pei Wang,, Weiyang Wang, Heng Xu, Yuanpei Yang, Yongkun Zhang, Dejiang Zhou, Yuhao Zhu,, Can-Min Deng, Yonghua Xu
TL;DR
This paper reports on the measurement of scintillation velocity variations of FRB 20201124A, revealing an annual pattern caused by a nearby scattering screen, indicating that the scintillation is mainly influenced by local Galactic material.
Contribution
The study provides the first detailed analysis of scintillation velocity and arc variations of FRB 20201124A, identifying a nearby anisotropic scattering screen as the primary cause.
Findings
Annual variation in scintillation velocity observed
Scattering screen located at approximately 0.4 kpc from Earth
Scintillation mainly caused by local Galactic material
Abstract
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 0.40.1~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.
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Taxonomy
TopicsGamma-ray bursts and supernovae · Astrophysics and Cosmic Phenomena