• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Detection of a radio counterpart to the 27 December 2004 giant flare from SGR 1806-20
【24h】

Detection of a radio counterpart to the 27 December 2004 giant flare from SGR 1806-20

机译：从SGR 1806-20中检测到与2004年12月27日的巨型耀斑相对应的无线电广播

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

It was established over a decade ago that the remarkable high-energy transients known as soft gamma-ray repeaters (SGRs) are located in our Galaxy(1,2) and originate from neutron stars with intense (<= 10(15)G) magnetic fields-so-called 'magnetars'(3). On 27 December 2004, a giant flare(4) with a fluence(5) exceeding 0.3 erg cm(-2) was detected from SGR 1806-20. Here we report the detection of a fading radio counterpart to this event. We began a monitoring programme from 0.2 to 250 GHz and obtained a high-resolution 21-cm radio spectrum that traces the intervening interstellar neutral hydrogen clouds. Analysis of the spectrum yields the first direct distance measurement of SGR 1806-20: the source is located at a distance greater than 6.4 kpc and we argue that it is nearer than 9.8 kpc. If correct, our distance estimate lowers the total energy of the explosion and relaxes the demands on theoretical models. The energetics and the rapid decay of the radio source are not compatible with the afterglow model that is usually invoked for gamma-ray bursts. Instead, we suggest that the rapidly decaying radio emission arises from the debris ejected during the explosion.
机译：成立于十多年前，被称为软伽玛射线中继器（SGR）的引人注目的高能瞬变位于我们的银河系（1,2）中，起源于具有强烈（<= 10（15）G）的中子星磁场-所谓的“磁场”（3）。 2004年12月27日，从SGR 1806-20中检测到通量（5）超过0.3 erg cm（-2）的巨型火炬（4）。在这里，我们报告检测到与此事件相对应的无线电衰落。我们开始了从0.2到250 GHz的监视程序，并获得了高分辨率的21厘米无线电频谱，该频谱跟踪了中间的星际中性氢云。频谱分析产生了SGR 1806-20的第一个直接距离测量：源位于大于6.4 kpc的距离处，我们认为它比9.8 kpc更近。如果正确，我们的距离估计会降低爆炸的总能量并放宽对理论模型的要求。无线电源的能量和快速衰减与通常用于伽马射线猝发的余辉模型不兼容。取而代之的是，我们建议迅速衰减的无线电发射源于爆炸过程中喷出的碎屑。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号