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Scintillation velocity and arc observations of FRB 20201124A

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arxiv 2406.12218 v1 pith:CIAA6BAW submitted 2024-06-18 astro-ph.HE

Scintillation velocity and arc observations of FRB 20201124A

Ziwei Wu , Weiwei Zhu , Bing Zhang , Yi Feng , JinLin Han , Di Li , Dongzi Li , Rui Luo
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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
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keywords scintillationannualobservationsvariationvelocitycausedearthanisotropic
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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 0.4$\pm$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.

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