在银河中心的430帕塞克双极无线电气泡膨胀
I Heywood1,2,3, F Camilo4, W D Cotton5,6
1Department of Physics, University of Oxford, Oxford, UK. ian.heywood@physics.ox.ac.uk.
Nature
|September 13, 2019
概括
无线电成像显示银河中心附近有一个巨大的双极气泡结构. 这种能量事件很可能来自过去的爆发, 创造了气泡,
科学领域:
- 天体物理学
- 银河系天文学
- 高能量的现象
背景情况:
- 银河系中心拥有超大质量黑洞和独特的密集气体环境.
- 存在能量爆发和恒星形成的证据, 受黑洞和气体密度的影响.
- 银河系中心的内部呈现出高度的宇宙射线电离,不寻常的化学反应,以及未知来源的射电发射线.
研究的目的:
- 调查银河系中心发射的磁丝的起源.
- 描述与银河系中心相关的大规模能量现象.
主要方法:
- 使用先进的无线电成像技术绘制银河系中心区域的地图.
- 分析了新发现的结构的形态和特性.
主要成果:
- 在银河平面上方和下方发现一个大双极气泡结构, 跨越1x3度 (140x430帕塞克).
- 结构是边缘明亮的, 有界的, 和对称的,
- 估计气泡年龄为几百万年,总能量为7x10^52 ergs.
结论:
- 双极气泡很可能是由银河系中心过去的能量事件造成的.
- 这一事件被认为是宇宙射线密度增加的重要来源.
- 事件是相对论粒子的主要来源,在附近的无线电丝中驱动同步发射.
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