“牙刷”无线电遗迹的重新加速模型

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Journal of the Korean Astronomical Society Pub Date : 2016-03-24 DOI:10.5303/JKAS.2016.49.3.083

Hyesung Kang

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引用次数: 14

摘要

与合并星团1RXS J060303.3相关的牙刷无线电遗迹被认为是由合并驱动激波加速的相对论性电子产生的。由于从观测到的射电光谱指数推断出的激波马赫数M radio≈2.8比X射线观测估计出的激波马赫数M X > 1.5要大，因此我们考虑再加速模型，在该模型中，一个弱激波M s≈1.2 - 1.5扫过星系团内等离子体，并带着相对论性电子的预激波群。我们发现，斜率为s≈4.6的幂律动量谱和截止洛伦兹因子γ e,c≈7-8 x 10 4的模型可以较好地再现观测到的射电光谱和牙刷遗迹头部部分的综合射电频谱。这项研究证实了普遍存在的源自agn的相对论性等离子体化石与星系团内介质中射电遗迹的冲击加速模型之间的紧密联系。

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RE-ACCELERATION MODEL FOR THE ‘TOOTHBRUSH’ RADIO RELIC

The Toothbrush radio relic associated with the merging cluster 1RXS J060303.3 is presumed to be produced by relativistic electrons accelerated at merger-driven shocks. Since the shock Mach number inferred from the observed radio spectral index, M radio ≈ 2.8, is larger than that estimated from X-ray observations, M X ≲ 1.5, we consider the re-acceleration model in which a weak shock of M s ≈ 1.2 - 1.5 sweeps through the intracluster plasma with a preshock population of relativistic electrons. We nd the models with a power-law momentum spectrum with the slope, s ≈ 4.6, and the cutoff Lorentz factor,γ e,c ≈ 7-8 x 10 4 can reproduce reasonably well the observed proles of radio uxes and integrated radio spectrum of the head portion of the Toothbrush relic. This study conrms the strong connection between the ubiquitous presence of fossil relativistic plasma originated from AGNs and the shock-acceleration model of radio relics in the intracluster medium.

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来源期刊

Journal of the Korean Astronomical Society 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.