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VHE γ-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC Telescope

机译:MAGIC望远镜对蟹状星云及其脉冲星的VHEγ射线观测

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We report about very high energy (VHE) γ-ray observations of the Crab Nebula with the MAGIC telescope. The γ-ray flux from the nebula was measured between 60 GeV and 9 TeV. The energy spectrum can be described by a curved power law dF/dE = f0(E/300 GeV)[a+blog10(E/300 GeV)] with a flux normalization f0 of (6.0 ± 0.2stat) × 10?10 cm?2 s?1 TeV?1, a = ? 2.31 ± 0.06stat, and b = ? 0.26 ± 0.07stat. The peak in the spectral energy distribution is estimated at 77 ± 35 GeV. Within the observation time and the experimental resolution of the telescope, the γ-ray emission is steady and pointlike. The emission's center of gravity coincides with the position of the pulsar. Pulsed γ-ray emission from the pulsar could not be detected. We constrain the cutoff energy of the pulsed spectrum to be less than 27 GeV, assuming that the differential energy spectrum has an exponential cutoff. For a superexponential shape, the cutoff energy can be as high as 60 GeV.
机译:我们用MAGIC望远镜报道了蟹状星云的超高能(VHE)γ射线观测。在60 GeV和9 TeV之间测量了来自星云的γ射线通量。能谱可以用弯曲的功率定律dF / dE = f0(E / 300 GeV)[a + blog10(E / 300 GeV)]描述,通量归一化f0为(6.0±0.2stat)×10?10 cm ?2 s?1 TeV?1,a =? 2.31±0.06stat,b =? 0.26±0.07stat。光谱能量分布的峰值估计为77±35 GeV。在观测时间和望远镜的实验分辨率范围内,γ射线发射稳定且呈点状。发射的重心与脉冲星的位置重合。无法检测到来自脉冲星的脉冲γ射线发射。假设差分能谱具有指数截止,我们将脉冲光谱的截止能量限制为小于27 GeV。对于超指数形状,截止能量可以高达60 GeV。

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