Cahill Center for Astronomy and Astrophysics, MC249-17, California Institute of Technology, Pasadena, CA 91125, USA.
Commonwealth Scientific and Industrial Research Organization (CSIRO) Astronomy and Space Science, Australia Telescope National Facility, Post Office Box 76, Epping, NSW 1710, Australia.
Science. 2016 Dec 9;354(6317):1249-1252. doi: 10.1126/science.aaf6807. Epub 2016 Nov 17.
Fast radio bursts (FRBs) are millisecond-duration events thought to originate beyond the Milky Way galaxy. Uncertainty surrounding the burst sources, and their propagation through intervening plasma, has limited their use as cosmological probes. We report on a mildly dispersed (dispersion measure 266.5 ± 0.1 parsecs per cubic centimeter), exceptionally intense (120 ± 30 janskys), linearly polarized, scintillating burst (FRB 150807) that we directly localize to 9 square arc minutes. On the basis of a low Faraday rotation (12.0 ± 0.7 radians per square meter), we infer negligible magnetization in the circum-burst plasma and constrain the net magnetization of the cosmic web along this sightline to <21 nanogauss, parallel to the line-of-sight. The burst scintillation suggests weak turbulence in the ionized intergalactic medium.
快速射电暴（FRBs）是持续时间为毫秒级的事件，据信源自银河系之外。由于暴源及其在传播过程中穿过的等离子体的不确定性，它们在宇宙学探测中的应用受到了限制。我们报告了一个轻度弥散（色散量 266.5 ± 0.1 立方厘米每立方厘米）、异常强烈（120 ± 30 尔格每平方秒）、线偏振、闪烁的爆发（FRB 150807），我们直接将其定位在 9 平方角分。基于低的法拉第旋转（12.0 ± 0.7 弧度每平方米），我们推断在爆发周围的等离子体中磁化程度可以忽略不计，并限制了沿着这条视线的宇宙网的总磁化强度<21 纳高斯，与视线平行。爆发闪烁表明电离的星系际介质中存在弱湍动。
