Temporal Evolution of Depolarization and Magnetic Field of Fast Radio Burst 20201124A

IF 8.8 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astrophysical Journal Letters Pub Date : 2023-10-01 DOI:10.3847/2041-8213/acf8cb

Wan-Jin Lu, Zhen-Yin Zhao, F. Y. Wang, Z. G. Dai

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引用次数: 0

Abstract

Abstract Fast radio bursts (FRBs) are energetic millisecond phenomena in the radio band. Polarimetric studies of repeating FRBs indicate that many of these sources occupy extreme and complex magnetoionized environments. Recently, a frequency-dependent depolarization has been discovered in several repeating FRBs. However, the temporal evolution of polarization properties is limited by the burst rate and observational cadence of telescopes. In this Letter, the temporal evolution of depolarization in repeating FRB 20201124A is explored. Using the simultaneous variation of rotation measure and dispersion measure, we also measure the strength of a magnetic field parallel to the line of sight. The strength ranges from a few μ G to 10 3 μ G. In addition, we find that the evolution of depolarization and magnetic field traces the evolution of rotation measure. Our result supports that the variation of depolarization, rotation measure, and the magnetic field are determined by the same complex magnetoionized screen surrounding the FRB source. The derived properties of the screen are consistent with the wind and the decretion disk of a massive star.

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快速射电暴20201124A去极化和磁场的时间演化

快速射电暴(FRBs)是射电频带中的高能毫秒现象。重复快速射电暴的极化研究表明，许多这些源占据极端和复杂的磁电离环境。最近，在几个重复的快速射电暴中发现了频率相关的去极化现象。然而，偏振特性的时间演化受到射电暴速率和望远镜观测节奏的限制。本文对重复FRB 20201124A去极化的时间演化进行了探讨。利用旋转量和色散量的同时变化，我们还测量了平行于视线的磁场强度。强度范围从几μ G到10.3 μ G。此外，我们发现退极化和磁场的演变跟踪了旋转测量的演变。我们的研究结果支持了退极化、旋转量和磁场的变化是由围绕FRB源的同一复合磁电离屏决定的。屏风的衍生性质与大质量恒星的风和行星盘一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-

CiteScore

14.10

自引率

6.30%

发文量

513

审稿时长

2-3 weeks

期刊介绍： The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.