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arXiv 1306.6048astro-ph.HE
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用XMM-Newton观测SN 1006同步辐射的截止形状

The shape of the cutoff in the synchrotron emission of SN 1006 observed with XMM-Newton

M. Miceli, F. Bocchino, A. Decourchelle, J. Vink, S. Broersen, S. Orlando

摘要:

年轻超新星遗迹边缘的同步加速器X射线辐射使我们能够研究在冲击波前沿加速的电子的高能尾部。X射线光谱的分析可以提供有关限制电子在加速过程中获得的能量的物理机制的信息。我们的目的是验证是否在SN 1006的最大电子能量是有限的同步辐射损失,并在获得的X射线同步辐射的截止形状的信息。我们分析了XMM-牛顿SN 1006大型计划的深层观测。我们进行了空间分辨光谱分析的一组小区域的非热肢和研究的X射线光谱,采用模型,假设不同的电子光谱。我们发现,损失限制模型对所有的谱都有最好的拟合,这表明电子动量(p)分布的截止形状为exp[-(p/p_cut)^2]。我们还检测到残余的热辐射从冲击环境介质,并证实了以前的估计的可靠性冲击后的密度。我们的研究结果表明,辐射损失在塑造SN 1006的电子光谱中起着重要的作用。

英文摘要:

Synchrotron X-ray emission from the rims of young supernova remnants allows us to study the high-energy tail of the electrons accelerated at the shock front. The analysis of X-ray spectra can provide information on the physical mechanisms that limit the energy achieved by the electrons in the acceleration process. We aim at verifying whether the maximum electron energy in SN 1006 is limited by synchrotron losses and at obtaining information on the shape of the cutoff in the X-ray synchrotron emission. We analyzed the deep observations of the XMM-Newton SN 1006 Large Program. We performed spatially resolved spectral analysis of a set of small regions in the nonthermal limbs and studied the X-ray spectra by adopting models that assume different electron spectra. We found out that a loss-limited model provides the best fit to all the spectra and this indicates that the shape of the cutoff in the electron momentum (p) distribution has the form exp[-(p/p_cut)^2]. We also detected residual thermal emission from shocked ambient medium and confirmed the reliability of previous estimates of the post-shock density. Our results indicate that radiative losses play a fundamental role in shaping the electron spectrum in SN 1006.

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