Investigating FRB 20240114A with FAST: Morphological Classification and Drifting Rate Measurements in a Burst-Cluster Framework
Year: 2025
Type: preprint
Abstract: This study investigates the morphological classification and drifting rate measurement of the repeating fast radio burst (FRB) source FRB 20240114A using the Five-hundred-meter Aperture Spherical Telescope (FAST). Detected on January 14, 2024, FRB 20240114A exhibited an exceptionally high burst rate, revealing unique properties. Through observational campaigns over several months, we selected a dataset comprising 3,203 bursts (2,109 burst-clusters) during a continuous monitoring session (15,780 seconds) on March 12, 2024. Improving upon previous work, we clarify the definitions of sub-bursts, bursts and burst-clusters. Using an average dispersion measures (DM) of 529.2 pc cm$^{-3}$, we classified the burst-clusters into Downward Drifting, Upward Drifting, No Drifting, No Evidence for Drifting, Not-Clear, and Complex burst-clusters. Among the 978 burst-clusters that exhibit drifting behavior, 233 (23.82%) show upward drifting. Additionally, if 142 upward drifting single-component burst-clusters are excluded, upward drifting double- and multi-component burst-clusters still account for 10.89% of the 836 burst-clusters exhibiting drifting behavior, equating to 91 burst-clusters. Furthermore, if only upward drifting burst-clusters with consecutive time intervals (or upward drifting bursts) are considered, only 9 bursts remain. Drifting rate comparisons with other physical quantities reveal that the drifting rate increases with peak frequency for single-component burst-clusters with drifting behavior. Moreover, in single-component burst-clusters, those with upward drifting exhibit smaller effective widths, bandwidths, and fluxes than their downward drifting counterparts. A Kolmogorov-Smirnov test further indicates that upward drifting burst-clusters possess longer consecutive time intervals than downward drifting ones, suggesting distinct underlying physical mechanisms.
Source: arXiv (Cornell University)
Authors: Zhang, Long-Xuan, Tian, Shiyan, Shen, Junyi, Zhang, Jun-Shuo, Zhou, Dejiang, Zhou, Lin, Ma, Po, Wang, Tian-Cong, Zhou, Dengke, Han, Jinlin, Men, Yunpeng, Wang, Fayin, Niu, Jiarui, Wang, Pei, Zhu, Weiwei, Zhang, Bing, Li, Di, Zou, Yuan-Chuan, Wang, Wei-Yang, Yang, Yuan-Pei, Wu, Qin, Gao, He, Lee, Ke-Jia, Luo, Jia-Wei, Luo, Rui, Tsai, Chao-Wei, Lin, Lin, Lu, Wanjin, Xie, Jintao, Fang, Jianhua, Cao, Jinhuang, Miao, Chen-Chen, Zhu, Yuhao, Chen, Yunchuan, Zhang, Yong-Kun, Cao, Shuo, Wu, Zi-Wei, Zhang, Chunfeng, Xu, Silu, Chen, Huaxi, Chen, Xiang-Lei, Cui, Xianghan, Feng, Yi, Huang, Yu-Xiang, Jing, Weicong, Li, Dong-Zi, Li, Jian, Li, Ye, Niu, Chen-Hui, Huang, Yong-Feng, Qu, Qingyue, Qu, Yuanhong, Wang, Bojun, Wang, Yi-Dan, Weng, Suming, Wu, Xuefeng, Xu, Heng, Yew, Shihan, Yang, Aiyuan, Yu, Wenfei, Zhang, Lei, Zhao, Rushuang
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6979355775
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