“错误路径”无线电遗迹的形成机制

IF 8.8 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Letters Pub Date : 2023-11-01 DOI:10.3847/2041-8213/ad03f7
Ludwig M. Böss, Ulrich P. Steinwandel, Klaus Dolag
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引用次数: 0

摘要

射电遗迹通常被发现是在合并星系团外围的同步辐射弧状区域,从星系团中心弯曲出来。在大多数情况下,它们显示出向星团中心方向变陡的同步加速器光谱,表明它们是由向外移动的合并激波加速的相对论性电子引起的。许多无线电遗迹打破了这一理想图像,显示出相反的形态,并显示出与理想图像预期不同的光谱指数分布。我们提出,当一个向外传播的激波被一个落入的星系团或星群向内弯曲时,这些“错误方向”的遗迹就会形成。我们用一个超高分辨率的放大模拟大质量星系团,用一个动态的宇宙射线光谱模型来测试这一点。这使我们不仅可以研究碰撞激波时的同步辐射,还可以研究它们的同步辐射光谱,以解决在遗迹表面具有强烈变化光谱指数的遗迹的开放性问题。
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A Formation Mechanism for “Wrong Way” Radio Relics
Abstract Radio relics are typically found to be arc-like regions of synchrotron emission in the outskirts of merging galaxy clusters, bowing out from the cluster center. In most cases they show synchrotron spectra that steepen toward the cluster center, indicating that they are caused by relativistic electrons being accelerated at outward traveling merger shocks. A number of radio relics break with this ideal picture and show morphologies that are bent the opposite way and show spectral index distributions that do not follow expectations from the ideal picture. We propose that these “wrong way” relics can form when an outward traveling shock wave is bent inward by an infalling galaxy cluster or group. We test this in an ultra-high-resolution zoom-in simulation of a massive galaxy cluster with an on-the-fly spectral cosmic-ray model. This allows us to study not only the synchrotron emission at colliding shocks, but also their synchrotron spectra to address the open question of relics with strongly varying spectral indices over the relic surface.
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来源期刊
Astrophysical Journal Letters
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.
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