论文标题
大麦哲伦云中的脉冲星云中的伽马射线耀斑
Gamma-ray flares from pulsar wind nebulae in the Large Magellanic Cloud
论文作者
论文摘要
已知年轻的脉冲星风云（pwne）的高能辐射是可变的。这是蟹状星云可以进行快速亮丽和变暗的最大体现。大麦芽云中的两个脉冲星，PSR J0540-6919和PSR J0537-6910在进化上非常接近蟹，因此，人们可能期望与周围的pwne相同的变异性与蟹状星云相同。在这项工作中，我们使用Fermi大面积望远镜的数据在2008年8月至2021年12月收集的100 MEV-10 GEV范围内搜索这些pwne的可变性。我们在100-300 MEV，300-1000 MEV和1-10 GEV中构建了这些源的光曲线，并构建了这些来源的光曲线。与螃蟹相比，我们发现所有乐队中燃烧活动的证据，在$ e> 1 $ GEV时，没有耀斑。对100-300和300-1000 MEV频段中耀斑插曲的分析表明，其中一个质量的磁通量可能会增长$ \ 5-10美元。由于它们在天空中的邻近，我们对两个闪烁的爆发中的哪一个不信心。但是，在1-10的GEV频段中，LAT的角度分辨率更好，我们发现两者中的亮度增强了。我们检查可能导致观察到的可变性的可能污染物，但发现其贡献不相关。
High-energy radiation of young pulsar wind nebulae (PWNe) is known to be variable. This is most prominently exemplified by the Crab nebula which can undergo both rapid brightenings and dimmings. Two pulsars in the Large Magellanic Cloud, PSR J0540-6919 and PSR J0537-6910 are evolutionally very close to Crab, so one may expect the same kind of variability from the PWNe around them as from the Crab nebula. In this work we search for variability in these PWNe in gamma rays using the data from the Fermi Large Area Telescope in the range 100 MeV-10 GeV collected from August 2008 to December 2021. We construct light curves of these sources in the three bands, 100-300 MeV, 300-1000 MeV and 1-10 GeV with the one week time resolution. We find evidence of flaring activity in all the bands, in contrast with Crab, where no flares at $E>1$ GeV were observed. Analysis of the flaring episode in the 100-300 and 300-1000 MeV bands indicates that the flux of one of the PWNe could grew by a factor of $\approx 5-10$. We are not confident about which of the two PWNe flared because of their proximity in the sky. However, in the 1-10 GeV band where the angular resolution of the LAT is better, we find several episodes of enhanced brightness in both the PWNe. We check possible contaminants which could be responsible for the observed variability, but find their contribution not to be relevant.
