A radio counterpart to a neutron star merger
A radio counterpart to a neutron star merger
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DOI：
10.1126/science.aap9855
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发表时间：
2017-12-22
期刊：
影响因子：
56.9
通讯作者：
Singer, L. P.
中科院分区：
文献类型：
--
作者：
Hallinan, G.;Corsi, A.;Singer, L. P.
在双星星星合并事件GW170817中探测到引力波。对来自同一来源的电磁辐射的探测表明，合并发生在星系NGC 4993的外围，距离地球40兆秒差距。我们报告了在事件发生后16天出现的对应射电源的检测，使我们能够诊断合并的能量学和环境。观测到的无线电发射可以解释为一个准直的超相对论喷流，离轴观察，或温和的相对论喷出物茧。在合并后的100天内，射电光变曲线将使观测者能够区分这些模型，碎片的角速度和几何形状将可通过甚长基线干涉测量法直接测量。
Gravitational waves have been detected from a binary neutron star merger event, GW170817. The detection of electromagnetic radiation from the same source has shown that the merger occurred in the outskirts of the galaxy NGC 4993, at a distance of 40 megaparsecs from Earth. We report the detection of a counterpart radio source that appears 16 days after the event, allowing us to diagnose the energetics and environment of the merger. The observed radio emission can be explained by either a collimated ultrarelativistic jet, viewed off-axis, or a cocoon of mildly relativistic ejecta. Within 100 days of the merger, the radio light curves will enable observers to distinguish between these models, and the angular velocity and geometry of the debris will be directly measurable by very long baseline interferometry.