A blind search for prompt gamma-ray counterparts of fast radio bursts with Fermi-LAT data
A blind search for prompt gamma-ray counterparts of fast radio bursts with Fermi-LAT data
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DOI：
10.1093/mnras/stw1206
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发表时间：
2016-04
影响因子：
4.8
通讯作者：
S. Yamasaki;T. Totani;N. Kawanaka
中科院分区：
文献类型：
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作者：
S. Yamasaki;T. Totani;N. Kawanaka
快速射电暴（FRB）是一种在无线电波长中检测到的神秘闪光现象，持续时间仅为几毫秒，并且它们也可能具有瞬时伽马射线闪光。在这里，我们使用 7 年费米大面积望远镜 (Fermi-LAT) 全天伽马射线数据对毫秒持续时间的伽马射线闪光进行盲搜索。检测到大约 100 个候选闪光，但在去除那些与明亮稳定点源相关的闪光后，我们发现在高银河纬度区域（|b|>20 度）没有闪光事件。低纬度地区的事件与源自弥散伽马射线背景的统计侥幸一致。根据这些结果，我们将 FRB 的 GeV 伽马射线与射电通量比的上限设置为 xi \equiv (nu L_nu)_gamma / (nu L_nu)_radio < 10^8，具体取决于假设的 FRB 速率演化。尽管脉冲星的 xi 分布范围很广，但该极限与脉冲星发现的最大值相当。我们还将这个极限与 2004 年磁星 SGR 1806-20 巨型耀斑的光谱能量分布进行了比较。
Fast Radio Bursts (FRBs) are a mysterious flash phenomenon detected in radio wavelengths with a duration of only a few milliseconds, and they may also have prompt gamma-ray flashes. Here we carry out a blind search for msec-duration gamma-ray flashes using the 7-year Fermi Large Area Telescope (Fermi-LAT) all-sky gamma-ray data. About 100 flash candidates are detected, but after removing those associated with bright steady point sources, we find no flash events at high Galactic latitude region (|b|>20 deg). Events at lower latitude regions are consistent with statistical flukes originating from the diffuse gamma-ray background. From these results, we place an upper limit on the GeV gamma-ray to radio flux ratio of FRBs as xi \equiv (nu L_nu)_gamma / (nu L_nu)_radio < 10^8, depending on the assumed FRB rate evolution. This limit is comparable with the largest value found for pulsars, though xi of pulsars is distributed in a wide range. We also compare this limit with the spectral energy distribution of the 2004 giant flare of the magnetar SGR 1806-20.