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arXiv 1011.0145astro-ph.HEhep-ph
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壳型超新星遗迹RX J1713的多波长发射模拟7 -3946

Modeling the Multi-Wavelength Emission of Shell-Type Supernova Remnant RX J1713.7-3946

Qiang Yuan, Siming Liu, Zhonghui Fan, Xiaojun Bi, Christopher L. Fryer

摘要:

利用射电、X射线、GeV $γ$-TeV $γ$ -射线波段的多波段观测资料,研究了壳型超新星遗迹RX J1713.7-3946的辐射机制。采用马尔可夫链蒙特卡罗方法对高维模型参数空间进行了系统的探索。研究了$γ$射线辐射的三种情况:轻子、强子和混合辐射。从背景等离子体的热发射也包括约束的气体密度,假设电离平衡,并获得约0.03厘米$^{-3}$的2 $σ$上限,只要热能占显着的一部分的耗散的动能的SNR冲击。尽管系统误差在所有模型的$χ^2$谱拟合中占主导地位,但我们发现:1)轻子模型具有最好的约束模型参数,其值可以很容易地与典型超新星相适应,但对TeV $γ$射线数据的拟合相对较差:2)混合模型比轻子模型多了一个参数,显著改善了整体谱拟合; 3)强子模型比轻子模型多了三个参数,在模型参数约束相对不好、加速粒子谱很硬的情况下,对整个谱的拟合最好。当加速电子和加速质子的谱指数相同时,模型参数的不确定性显著降低。混合模型和强子模型也需要能量输入到高能质子中,与超新星爆炸的典型值相比,这似乎太高了。需要进一步的调查,以调和这些意见与信噪比理论。

英文摘要:

Emission mechanisms of the shell-type supernova remnant (SNR) RX J1713.7-3946 are studied with multi-wavelength observational data from radio, X-ray, GeV $γ$-ray to TeV $γ$-ray band. A Markov Chain Monte Carlo method is employed to explore the high-dimensional model parameter space systematically. Three scenarios for the $γ$-ray emission are investigated: the leptonic, the hadronic and a hybrid one. Thermal emission from the background plasma is also included to constrain the gas density, assuming ionization equilibrium, and a 2$σ$ upper limit of about 0.03 cm$^{-3}$ is obtained as far as thermal energies account for a significant fraction of the dissipated kinetic energy of the SNR shock. Although systematic errors dominate the $χ^2$ of the spectral fit of all models, we find that 1) the leptonic model has the best constrained model parameters, whose values can be easily accommodated with a typical supernova, but gives relatively poor fit to the TeV $γ$-ray data; 2) The hybrid scenario has one more parameter than the leptonic one and improves the overall spectral fit significantly; 3) The hadronic one, which has three more parameters than the leptonic model, gives the best fit to the overall spectrum with relatively not-well-constrained model parameters and very hard spectra of accelerated particles. The uncertainties of the model parameters decrease significantly if the spectral indices of accelerated electrons and protons are the same. The hybrid and hadronic models also require an energy input into high-energy protons, which seems to be too high compared with typical values of a supernova explosion. Further investigations are required to reconcile these observations with SNR theories.

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