紧的无线电辐射表明结构喷气是由一个双中子星的合并产生的
G Ghirlanda1,2,3, O S Salafia1,2,3, Z Paragi4
1Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy. giancarlo.ghirlanda@brera.inaf.it omsharan.salafia@brera.inaf.it.
概括
双中子恒星GW170817的合并产生了一个结构化的相对论喷流,而不是同流的外流. 这一发现基于无线电望远镜的观测, 表明至少10%的中子星合并会产生这种喷气.
科学领域:
- 天体物理学
- 多传递器天文学
背景情况:
- 通过电磁辐射和引力波观测到双中子星GW170817的合并.
- 后照辐射的来源 (相对射流与同位体外流) 仍然不确定.
研究的目的:
- 为了区分狭窄的相对论喷流和GW170817的后照的同位流.
- 为了确定中子星合并的喷气产量.
主要方法:
- 使用32台射电望远镜进行非常长基线干扰测量 (VLBI).
- 在合并后207.4天进行观察.
- 测量了明显的来源大小和位移.
主要成果:
- 限制明显的源大小为<2.5毫米弧秒 (90%的可靠性).
- 由于观察到的尺寸很小,因此排除了同位流的情况.
- 证实GW170817产生了一个结构相对论喷气.
结论:
- 观察到的余光与结构相对论喷气相一致.
- 估计至少10%的中子星合并会产生这种喷气.
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