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arXiv 2201.05567astro-ph.HE
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开普勒超新星遗迹的GeV发射的特征

Characterization of the GeV emission from the Kepler supernova remnant

Fabio Acero, Marianne Lemoine-Goumard, Jean Ballet

摘要:

开普勒超新星遗迹(SNR)是历史上唯一没有探测到GeV和TeV能量的超新星遗迹,探测粒子加速。最近对费米-LAT数据的分析报告了SNR方向上可能存在GeV伽马射线候选者。使用近似相同的数据集,但与优化的分析配置,我们确认的伽马射线候选人固体$>6σ$检测和报告的光谱指数$2.14 \pm 0.12_{\rm stat} \pm 0.15_{\rm syst}$的能量通量超过100兆电子伏的$(3.1 \pm 0.6_{\rm stat} \pm 0.3_{\rm syst}) \times 10^{-12}$尔格~cm $^{-2}$ ~s $^{-1}$。伽马射线过量没有显著扩展,并且与SNR的无线电、红外或X射线空间分布完全兼容。我们成功地描述了这种多波长发射的模型,在该模型中,加速粒子与SNR西北部的致密拱星材料相互作用,并通过$π^{o}$衰变辐射GeV的伽马射线。X射线同步辐射和逆康普顿(IC)辐射主要来自磁场B $\sim$ 100 $μ$ G或更高的南部地区的快震。根据精确的磁场幅度,TeV辐射可能来自南区(IC主导)或相互作用区($π^{o}$衰变主导)。

英文摘要:

The Kepler supernova remnant (SNR) is the only historic supernova remnant lacking a detection at GeV and TeV energies which probe particle acceleration. A recent analysis of Fermi-LAT data reported a likely GeV gamma-ray candidate in the direction of the SNR. Using approximately the same dataset but with an optimized analysis configuration, we confirm the gamma-ray candidate to a solid $>6σ$ detection and report a spectral index of $2.14 \pm 0.12_{\rm stat} \pm 0.15_{\rm syst}$ for an energy flux above 100 MeV of $(3.1 \pm 0.6_{\rm stat} \pm 0.3_{\rm syst}) \times 10^{-12}$ erg~cm$^{-2}$~s$^{-1}$. The gamma-ray excess is not significantly extended and is fully compatible with the radio, infrared or X-ray spatial distribution of the SNR. We successfully characterized this multi-wavelength emission with a model in which accelerated particles interact with the dense circumstellar material in the North-West portion of the SNR and radiate GeV gamma-rays through $π^{o}$ decay. The X-ray synchrotron and inverse-Compton (IC) emission mostly stem from the fast shocks in the southern regions with a magnetic field B$\sim$100 $μ$G or higher. Depending on the exact magnetic field amplitude, the TeV emission could arise from either the South region (IC dominated) or the interaction region ($π^{o}$ decay dominated).

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