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arXiv 1106.0184astro-ph.HE
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用费米大天区望远镜探测脉冲星风星云HESS J1825-137

Detection of the Pulsar Wind Nebula HESS J1825-137 with the Fermi Large Area Telescope

M. -H. Grondin, S. Funk, M. Lemoine-Goumard, A. Van Etten, J. A. Hinton, F. Camilo, I. Cognard, C. M. Espinoza, P. C. C. Freire, J. E. Grove, L. Guillemot, S. J… 展开作者

M. -H. Grondin, S. Funk, M. Lemoine-Goumard, A. Van Etten, J. A. Hinton, F. Camilo, I. Cognard, C. M. Espinoza, P. C. C. Freire, J. E. Grove, L. Guillemot, S. Johnston, M. Kramer, J. Lande, P. Michelson, A. Possenti, R. W. Romani, J. L. Skilton, G. Theureau, P. Weltevrede

摘要:

我们宣布发现1 - 100 GeV的伽马射线发射的原型TeV脉冲星风星云HESS J1825-137使用20个月的调查数据从费米大面积望远镜(LAT)。LAT探测到的伽马射线发射在空间上显著扩展,对于假设的高斯模型,最佳拟合均方根扩展为sigma = 0.56° $\pm$ 0.07°。该源的1 - 100 GeV LAT谱符合幂律,谱指数为1.38 $\pm$ 0.12 $\pm$ 0.16,1 GeV以上的积分通量为(6.50 $\pm$ 0.21 $\pm$ 3.90)x 10^{-9} cm^{-2} s^{-1}。第一个误差代表拟合参数的统计误差,而第二个是系统不确定性。详细的形态学和光谱分析对脉冲星风星云系统的能量学和磁场提出了新的约束。GeV辐射的空间范围和硬光谱与脉冲星PSR J1826-1334提供动力的冷却限制星云中GeV-TeV辐射的逆康普顿起源的图像一致。

英文摘要:

We announce the discovery of 1 - 100 GeV gamma-ray emission from the archetypal TeV pulsar wind nebula HESS J1825-137 using 20 months of survey data from the Fermi Large Area Telescope (LAT). The gamma-ray emission detected by the LAT is significantly spatially extended, with a best-fit rms extension of sigma = 0.56° $\pm$ 0.07° for an assumed Gaussian model. The 1 - 100 GeV LAT spectrum of this source is well described by a power-law with a spectral index of 1.38 $\pm$ 0.12 $\pm$ 0.16 and an integral flux above 1 GeV of (6.50 $\pm$ 0.21 $\pm$ 3.90) x 10^{-9} cm^{-2} s^{-1}. The first errors represent the statistical errors on the fit parameters, while the second ones are the systematic uncertainties. Detailed morphological and spectral analyses bring new constraints on the energetics and magnetic field of the pulsar wind nebula system. The spatial extent and hard spectrum of the GeV emission are consistent with the picture of an inverse Compton origin of the GeV-TeV emission in a cooling-limited nebula powered by the pulsar PSR J1826-1334.

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