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arXiv 0806.3347astro-ph
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H.E.S.S.开普勒超新星遗迹的上限

H.E.S.S. upper limits for Kepler's supernova remnant

HESS Collaboration, F. Aharonian

摘要:

开普勒超新星遗迹(G4.5+6.8)的H.E.S.S.观测给出了2004年和2005年总寿命为13 h望远镜阵列。来自广泛的空气簇射的切伦科夫辐射的立体成像用于重建入射伽马射线的能量和方向。没有证据表明从残骸的方向有非常高的能量(VHE:>100 GeV)的伽马射线信号,在230 GeV - 12.8 TeV范围内的能流上限(99%置信水平)为8.6 x 10^{-13} erg cm^{-2} s^{-1}。在现有的理论模型中,缺乏可探测的伽马射线通量意味着至少6.4千秒差距的距离。相应的上限为0.7 cm^{-3}的周围物质的密度推导出来。有了这个距离限制,并假设光谱指数Gamma = 2,加速质子的总能量被限制在E_p < 8.6 x 10^{49} erg。在同步加速器/逆康普顿框架中,外推由RXTE在10和20 keV之间测量的能量的幂律,从逆康普顿散射预测的伽马射线通量低于大于52 μ G的磁场值的测量上限。

英文摘要:

Observations of Kepler's supernova remnant (G4.5+6.8) with the H.E.S.S. telescope array in 2004 and 2005 with a total live time of 13 h are presented. Stereoscopic imaging of Cherenkov radiation from extensive air showers is used to reconstruct the energy and direction of the incident gamma rays. No evidence for a very high energy (VHE: >100 GeV) gamma-ray signal from the direction of the remnant is found. An upper limit (99% confidence level) on the energy flux in the range 230 GeV - 12.8 TeV of 8.6 x 10^{-13} erg cm^{-2} s^{-1} is obtained. In the context of an existing theoretical model for the remnant, the lack of a detectable gamma-ray flux implies a distance of at least 6.4 kpc. A corresponding upper limit for the density of the ambient matter of 0.7 cm^{-3} is derived. With this distance limit, and assuming a spectral index Gamma = 2, the total energy in accelerated protons is limited to E_p < 8.6 x 10^{49} erg. In the synchrotron/inverse Compton framework, extrapolating the power law measured by RXTE between 10 and 20 keV down in energy, the predicted gamma-ray flux from inverse Compton scattering is below the measured upper limit for magnetic field values greater than 52 muG.

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