Helical magnetic field structure in 3C 273

IF 5.4 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astronomy & Astrophysics Pub Date : 2025-06-17 DOI:10.1051/0004-6361/202453542

Teresa Toscano, Sol N. Molina, José L. Gómez, Ai-Ling Zeng, Rohan Dahale, Ilje Cho, Kotaro Moriyama, Maciek Wielgus, Antonio Fuentes, Marianna Foschi, Jan Röder, Ioannis Myserlis, Emmanouil Angelakis, Anton Zensus

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Abstract

We present a study on rotation measure (RM) of the quasar 3C 273. This analysis aims to discern the magnetic field structure and its temporal evolution. The quasar 3C 273 is one of the most studied active galactic nuclei due to its high brightness, strong polarisation, and proximity, which enables the resolving of the transverse structure of its jet in detail. We used polarised data from 2014, collected at six frequencies (5, 8, 15, 22, 43, 86 GHz) with the Very Long Baseline Array, to produce total and linear polarisation-intensity images, as well as RM maps. Our analysis reveals a well-defined transverse RM gradient across the jet, indicating a helical, ordered magnetic field that threads the jet and likely contributes to its collimation. Furthermore, we identified temporal variations in the RM magnitude when compared with prior observations. These temporal variations show that the environment around the jet is dynamic, with changes in the density and magnetic field strength of the sheath that are possibly caused by interactions with the surrounding medium.

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3C 273的螺旋磁场结构

我们研究了类星体3C 273的旋转测量（RM）。这一分析的目的是辨别磁场结构及其时间演变。类星体3C 273是被研究最多的活动星系核之一，由于它的高亮度、强偏振和近距离，这使得能够详细地分辨出它的喷流的横向结构。我们使用2014年的偏振数据，通过超长基线阵列在六个频率（5,8,15,22,43,86 GHz）收集，生成总偏振强度和线性偏振强度图像，以及RM图。我们的分析显示，射流上有一个明确的横向RM梯度，表明有一个螺旋的、有序的磁场穿过射流，并可能有助于其准直。此外，与先前的观测结果相比，我们确定了RM量级的时间变化。这些时间变化表明，射流周围的环境是动态的，鞘层的密度和磁场强度的变化可能是由与周围介质的相互作用引起的。

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

Astronomy & Astrophysics 地学天文-天文与天体物理

CiteScore

10.20

自引率

27.70%

发文量

2105

审稿时长

1-2 weeks

期刊介绍： Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.