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arXiv 2005.06125astro-ph.HE
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脉冲星风星云CTB87(G74 .9+1.2)的射电连续谱和偏振研究

A Radio Continuum and Polarisation Study of the pulsar wind nebula CTB87 (G74.9+1.2)

R. Kothes, W. Reich, S. Safi-Harb, B. Guest, P. Reich, E. Fürst

摘要:

我们提出了无线电连续和线性偏振观测的脉冲星风星云CTB87(G74.9+1.2)与Effelsberg 100米射电望远镜之间的4.75和32 GHz。对这些新数据的分析,包括加拿大银河平面调查局在1420兆赫和408兆赫的存档低频观测数据,表明CTB 87由两个不同的发射成分组成:一个紧凑的肾形组件,14个x 8.5个(7.8'x4.8')的大小和一个较大的弥漫性,球形和中央峰的组成部分,直径约30 pc(17 ')。肾形的组成部分具有更陡峭的无线电连续谱,是高度线性极化的,可能代表了一个遗留的脉冲星风星云。漫射分量代表PWN在空腔或恒星风气泡内膨胀的未受干扰部分。先前报告的10千兆赫以上的频谱中断可能是缺少大规模发射和高频无线电连续观测灵敏度不足的结果。对系统演化的模拟得出该系统的年龄约为18,000年,是II型超新星爆发的结果,其喷出物质量约为12个太阳质量,爆炸能量约为7 x 10^50 erg。我们还在偏振数据中发现了射电壳层的证据,它代表了以大约13 pc的半径进入分子云复合体的冲击波。

英文摘要:

We present radio continuum and linear polarisation observations of the pulsar wind nebula CTB87 (G74.9+1.2) with the Effelsberg 100-m radio telescope between 4.75 and 32 GHz. An analysis of these new data including archived low-frequency observations at 1420 MHz and 408 MHz from the Canadian Galactic Plane Survey shows that CTB87 consists of two distinct emission components: a compact kidney-shaped component, 14 pc x 8.5 pc (7.8' x 4.8') in size and a larger diffuse, spherical and centrally peaked component of about 30 pc (17') in diameter. The kidney-shaped component with a much steeper radio continuum spectrum is highly linearly polarised and likely represents a relic pulsar wind nebula. The diffuse component represents the undisturbed part of the PWN expanding inside a cavity or stellar wind bubble. The previously reported spectral break above 10 GHz is likely the result of missing large-scale emission and insufficient sensitivity of the high-frequency radio continuum observations. The simulation of the system's evolution yields an age of about 18,000 years as the result of a type II supernova explosion with an ejecta mass of about 12 solar masses and an explosion energy of about 7 x 10^50 erg. We also found evidence for a radio shell in our polarisation data which represents the blast wave that entered the molecular cloud complex at a radius of about 13 pc.

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