Based largely on energy budget considerations and the observed cosmic-ray (CR) ionic composition, supernova remnant (SNR) blast waves are the most likely sources of CR ions with energies at least up to the "knee" near 1015?eV. Shocks in young shell-type TeV-bright SNRs are surely producing TeV particles, but the emission could be dominated by ions producing π0-decay emission or electrons producing inverse Compton gamma rays. Unambiguously identifying the GeV-TeV emission process in a particular SNR will not only help pin down the origin of CRs, it will also add significantly to our understanding of the diffusive shock acceleration (DSA) mechanism and improve our understanding of supernovae and the impact SNRs have on the circumstellar medium. In this study, we investigate the Vela Jr. SNR, an example of TeV-bright non-thermal SNRs. We perform hydrodynamic simulations coupled with nonlinear DSA and non-equilibrium ionization near the forward shock to confront currently available multi-wavelength data. We find, with an analysis similar to that used earlier for SNR RX J1713.7–3946, that self-consistently modeling the thermal X-ray line emission with the non-thermal continuum in our one-dimensional model strongly constrains the fitting parameters, and this leads convincingly to a leptonic origin for the GeV-TeV emission for Vela Jr. This conclusion is further supported by applying additional constraints from observation, including the radial brightness profiles of the SNR shell in TeV gamma rays, and the spatial variation of the X-ray synchrotron spectral index. We will discuss implications of our models on future observations by the next-generation telescopes.
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机译：基于能量预算的考虑和观察到的宇宙射线（CR）离子组成，超新星残留（SNR）爆炸波是最有可能产生CR离子的能量，其能量至少达到1015？eV附近的“膝盖”。年轻的壳型TeV亮SNR的震荡肯定会产生TeV粒子，但这种发射可能会受到产生π0衰减发射的离子或产生反康普顿伽玛射线的电子的控制。明确地确定特定SNR中的GeV-TeV发射过程不仅有助于确定CR的起源，还将大大增加我们对扩散冲击加速（DSA）机理的理解，并增进我们对超新星和影响SNR的理解有在星际介质上的。在这项研究中，我们研究了Vela Jr. SNR，这是TeV明亮的非热SNR的示例。我们进行流体动力学模拟，并结合非线性DSA和正向冲击附近的非平衡电离，以应对当前可用的多波长数据。我们发现，通过与先前针对SNR RX J1713.7-3946进行的分析相似的分析，在我们的一维模型中使用非热连续体对热X射线线发射进行自洽建模会极大地限制拟合参数，这一结论令人信服地导致了Vela Jr的GeV-TeV发射的轻子起源。这一结论进一步得到了观察结果的进一步限制，包括TeV伽马射线中SNR壳的径向亮度分布以及空间的变化。 X射线同步加速器光谱指数。我们将讨论我们的模型对下一代望远镜未来观测的影响。
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