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arXiv 1502.02757astro-ph.HE
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用MAGIC望远镜探测蟹状星云脉冲星的VHE桥辐射

Detection of VHE Bridge emission from the Crab pulsar with the MAGIC Telescopes

T. Y. Saito, S. Bonnefoy, K. Hirotani, R. Zanin

摘要:

蟹状星云脉冲星是唯一一颗在100 GeV以上探测到的天文脉冲源。尽管已经提出了几个理论模型,但是非常高能量伽马射线脉动的发射机制还没有完全理解。为了检验新模型,我们采用深空观测的方法,高精度地测量了蟹状星云脉冲星的光变曲线和光谱。我们分析了2009年至2013年在立体模式下拍摄的135小时选定的MAGIC数据。为了讨论与低能量有关的光谱形状,还分析了4.6年的费米LAT数据。检测到每个周期的已知两个脉冲的显著性为8.0 sigma和12.6 sigma。此外,在两个脉冲之间发现了显著的桥发射,具有6.2 σ。现有的理论不能解释这种发射。这些数据可用于测试新的理论模型。

英文摘要:

The Crab pulsar is the only astronomical pulsed source detected above 100 GeV. The emission mechanism of very high energy gamma-ray pulsation is not yet fully understood, although several theoretical models have been proposed. In order to test the new models, we measured the light curve and the spectra of the Crab pulsar with high precision by means of deep observations. We analyzed 135 hours of selected MAGIC data taken between 2009 and 2013 in stereoscopic mode. In order to discuss the spectral shape in connection with lower energies, 4.6 years of Fermi-LAT data were also analyzed. The known two pulses per period were detected with a significance of 8.0 sigma and 12.6 sigma. In addition, significant bridge emission was found between the two pulses with 6.2 sigma. This emission can not be explained with the existing theories. These data can be used for testing new theoretical models.

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