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极端散射事件的实时检测:银河系等离子镜片的限制
Keith W Bannister1, Jamie Stevens2, Artem V Tuntsov3
1Commonwealth Scientific and Industrial Research Organisation Astronomy and Space Science, PO Box 76, Epping, New South Wales 1710, Australia. keith.bannister@csiro.au.
Science (New York, N.Y.)
|January 23, 2016
概括
极端散射事件 (ESEs) 是由星际等离子镜片引起的短暂而强烈的射电源亮度波动. 一种新的调查技术使得正在进行的ESE的发现成为可能,揭示了其分散的密度增强结构.
科学领域:
- 天文学与天体物理学
- 星际介质物理
背景情况:
- 极端散射事件 (ESEs) 具有快速的无线电源亮度波动的特点.
- 恒星间介质中的等离子透镜具有明显超过环境条件的压力.
- 这些等离子镜片的确切性质和起源尚不清楚,这对银河系气体条件的模型构成挑战.
研究的目的:
- 通过同时进行无线电和光学观测来研究极端散射事件 (ESE) 的物理性质.
- 通过对透镜结构进行描述来测试ESE的竞争物理模型.
- 展示一种新的实时发现和研究ESE的调查技术的有效性.
主要方法:
- 在活动阶段进行了一项新的调查以检测ESE.
- 进行后续无线电观测以分析光源的光曲线和光谱特性.
- 进行光学观察以寻找任何相关现象.
- 模拟无线电数据以确定中间等离子透镜的几何和物理特性.
主要成果:
- 一个正在进行的ESE被发现使用了新的调查技术.
- 无线电数据建模证实了透镜结构作为一个分离密度增强.
- 这一发现排除了竞争模式的趋同镜头.
- 光学观察提供了关于事件的补充数据.
结论:
- 观测到的ESE是由星际介质的密度增强引起的.
- 这一发现为了解等离子镜的物理提供了关键的限制.
- 新的调查技术对于发现像ESE这样的短暂现象是有效的.
- 这项技术的进一步应用将有助于解决银河系小规模气体结构的.
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