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依据不同磁场模型科学家发现伽马射线暴偏振机制 - 站长搜索
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依据不同磁场模型科学家发现伽马射线暴偏振机制

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2020-10-27 08:49:06 转载来源: 科技日报

科技日报讯 (记者赵汉斌 通讯员陈艳)记者10月24日了解到,中国科学院云南天文台的一项新研究,给出了大尺度衰减磁场环境下伽马暴同步辐射的偏振特性,发现在大尺度的环形磁场模型下,偏轴观测的伽马暴理论上都会在单脉冲内发生偏振面旋转90度的现象。英国《皇家天文学会月刊》在线发表了这一重要研究成果

科技日报讯 (记者赵汉斌 通讯员陈艳)记者10月24日了解到,中国科学院云南天文台的一项新研究,给出了大尺度衰减磁场环境下伽马暴同步辐射的偏振特性,发现在大尺度的环形磁场模型下,偏轴观测的伽马暴理论上都会在单脉冲内发生偏振面旋转90度的现象。英国《皇家天文学会月刊》在线发表了这一重要研究成果。

目前,科学家对于伽马暴辐射区的磁场结构和伽马暴的辐射机制并不了解。偏振可以作为研究伽马暴辐射机制和辐射区磁场结构的重要探针,不同的偏振特性,往往预示着不同的辐射机制及不同的磁场结构。在以前的伽马暴辐射机制和偏振研究中,为了简化研究,往往只考虑磁场为常数的情况。在此次研究中,科学家研究了大尺度衰减磁场下伽马暴的偏振特性,并与常数磁场模型的偏振进行比较,给出了不同磁场模型下的偏振特性。

中国科学院云南天文台博士研究生程康法和副研究员赵晓红等人计算了50—500keV能段内大尺度衰减磁场和常数磁场下伽马暴单脉冲内的同步辐射偏振。他们通过比较发现,对于视角小于喷流半张角的“正轴”观测情形,大尺度衰减磁场下的时间平均偏振度高于常数磁场。

另外,时间分辨偏振的计算结果显示,环形磁场下单脉冲内视角大于喷流半张角的“偏轴”观测偏振度会从正值演化为负值,这意味着偏振面旋转了90度,该结果与观测上一些伽马暴的偏振面旋转相一致。

“将来一些高精度伽马暴偏振探测器有可能观测到伽马暴高精度偏振。利用这些偏振观测,并结合我们的理论研究结果,将能够更清楚地认识伽马暴辐射区的磁场结构,进一步揭示伽马暴的辐射机制。”赵晓红说。

标签: 依据 不同 磁场 模型 科学家 发现 伽马射线 偏振 机制


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