一个明亮的毫秒燃料无线电从银河磁铁爆发

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一个明亮的毫秒燃料无线电从银河磁铁爆发

A bright millisecond-duration radio burst from a Galactic magnetar

论文作者

FRB Collaboration, Andersen, B. C., Bandura, K. M., Bhardwaj, M., Bij, A., Boyce, M. M., Boyle, P. J., Brar, C., Cassanelli, T., Chawla, P., Chen, T., Cliche, J. -F., Cook, A., Cubranic, D., Curtin, A. P., Denman, N. T., Dobbs, M., Dong, F. Q., Fandino, M., Fonseca, E., Gaensler, B. M., Giri, U., Good, D. C., Halpern, M., Hill, A. S., Hinshaw, G. F., Höfer, C., Josephy, A., Kania, J. W., Kaspi, V. M., Landecker, T. L., Leung, C., Li, D. Z., Lin, H. -H., Masui, K. W., Mckinven, R., Mena-Parra, J., Merryfield, M., Meyers, B. W., Michilli, D., Milutinovic, N., Mirhosseini, A., Münchmeyer, M., Naidu, A., Newburgh, L. B., Ng, C., Patel, C., Pen, U. -L., Pinsonneault-Marotte, T., Pleunis, Z., Quine, B. M., Rafiei-Ravandi, M., Rahman, M., Ransom, S. M., Renard, A., Sanghavi, P., Scholz, P., Shaw, J. R., Shin, K., Siegel, S. R., Singh, S., Smegal, R. J., Smith, K. M., Stairs, I. H., Tan, C. M., Tendulkar, S. P., Tretyakov, I., Vanderlinde, K., Wang, H., Wulf, D., Zwaniga, A. V.

论文摘要

磁铁是高度磁化的年轻中子星，偶尔会产生X射线和伽马射线的巨大爆发和耀斑。在我们的银河系和麦哲伦云中目前已知的大约三十磁铁中，有5个表现出瞬态无线电搏动。快速无线电爆发（FRB）是从宇宙学距离到达的无线电波爆发。有些人被看到重复。重复FRB的领先模型是它们是外层磁铁，由其强烈的磁场提供动力。但是，对该模型的挑战是，FRB必须具有比已知的银河磁铁中的无线电照明大量数量级。在这里，我们报告了使用加拿大氢强度映射实验（Chime）FRB项目从银河磁铁SGR 1935+2154中检测出极为强烈的无线电爆发。这两个两部分的明亮无线电爆发和SGR 1935+2154的估计距离的流动性意味着$ \ sim 3 \ sim 3 \ times 10^{34} $ erg的400-800 MHz爆发能量，这是比远处检测到的任何无线电磁力磁力的三个幅度更明亮的。来自附近银河系的这样的爆发与典型的FRB无法区分。因此，该事件桥接了银河系和FRB的种群之间的无线电能量差距很大一部分，从而强烈支持磁铁是至少某些FRB的起源的观念。

Magnetars are highly magnetized young neutron stars that occasionally produce enormous bursts and flares of X-rays and gamma-rays. Of the approximately thirty magnetars currently known in our Galaxy and Magellanic Clouds, five have exhibited transient radio pulsations. Fast radio bursts (FRBs) are millisecond-duration bursts of radio waves arriving from cosmological distances. Some have been seen to repeat. A leading model for repeating FRBs is that they are extragalactic magnetars, powered by their intense magnetic fields. However, a challenge to this model has been that FRBs must have radio luminosities many orders of magnitude larger than those seen from known Galactic magnetars. Here we report the detection of an extremely intense radio burst from the Galactic magnetar SGR 1935+2154 using the Canadian Hydrogen Intensity Mapping Experiment (CHIME) FRB project. The fluence of this two-component bright radio burst and the estimated distance to SGR 1935+2154 together imply a 400-800 MHz burst energy of $\sim 3 \times 10^{34}$ erg, which is three orders of magnitude brighter than those of any radio-emitting magnetar detected thus far. Such a burst coming from a nearby galaxy would be indistinguishable from a typical FRB. This event thus bridges a large fraction of the radio energy gap between the population of Galactic magnetars and FRBs, strongly supporting the notion that magnetars are the origin of at least some FRBs.

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