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arXiv 1808.00469astro-ph.HE
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致密射电辐射表明一个结构喷流是由一个双中子星合并产生的

Compact radio emission indicates a structured jet was produced by a binary neutron star merger

G. Ghirlanda, O. S. Salafia, Z. Paragi, M. Giroletti, J. Yang, B. Marcote, J. Blanchard, I. Agudo, T. An, M. G. Bernardini, R. Beswick, M. Branchesi, S. Campana… 展开作者

G. Ghirlanda, O. S. Salafia, Z. Paragi, M. Giroletti, J. Yang, B. Marcote, J. Blanchard, I. Agudo, T. An, M. G. Bernardini, R. Beswick, M. Branchesi, S. Campana, C. Casadio, E. Chassande-Mottin, M. Colpi, S. Covino, P. D'Avanzo, V. D'Elia, S. Frey, M. Gawronski, G. Ghisellini, L. I. Gurvits, P. G. Jonker, H. J. van Langevelde, A. Melandri, J. Moldon, L. Nava, A. Perego, M. A. Perez-Torres, C. Reynolds, R. Salvaterra, G. Tagliaferri, T. Venturi, S. D. Vergani, M. Zhang

摘要:

通过电磁辐射和引力波探测到了双星中子星合并事件GW 170817。它的余辉发射可能是由狭窄的相对论性喷流或各向同性外流产生的。对震源大小和位移的高空间分辨率测量可以区分这些情况。我们提出了甚长基线干涉观测,合并后207.4天,使用全球网络的32个射电望远镜。在90%的置信水平下,视源尺寸被限制为小于2.5毫弧秒。这排除了各向同性外流的情况,这将产生更大的表观尺寸,表明GW 170817产生了结构化的相对论性喷流。我们的速率计算表明,至少有10%的中子星合并产生这样的喷流。

英文摘要:

The binary neutron star merger event GW170817 was detected through both electromagnetic radiation and gravitational waves. Its afterglow emission may have been produced by either a narrow relativistic jet or an isotropic outflow. High spatial resolution measurements of the source size and displacement can discriminate between these scenarios. We present Very Long Baseline Interferometry observations, performed 207.4 days after the merger, using a global network of 32 radio telescopes. The apparent source size is constrained to be smaller than 2.5 milliarcseconds at the 90% confidence level. This excludes the isotropic outflow scenario, which would have produced a larger apparent size, indicating that GW170817 produced a structured relativistic jet. Our rate calculations show that at least 10% of neutron star mergers produce such a jet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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