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arXiv 0806.4393astro-ph
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超新星遗迹的非热韧致辐射和库仑损失的影响

Non-thermal bremsstrahlung from supernova remnants and the effect of Coulomb losses

Jacco Vink

摘要:

我调查的电子宇宙射线谱的形状在范围内高达~1000千电子伏,假设在冲击的加速过程中的结果在一个幂律的动量,和下游的冲击的频谱是受库仑相互作用与背景电子只。在非相对论的情况下,人们可以用解析的方法确定一个电子的能量,并利用这个结果来产生一个电子宇宙射线谱,经过库仑损耗的修正。得到了电子能谱的解析表达式,它依赖于参数n_et,这可以从一个类似的参数来估计用于表征超新星遗迹的线光谱。对于最明亮的超新星遗迹,n_e t> 1e 11 cm ^-3 s,并且大多数加速到<100 keV的电子已经失去了能量。由于其高射电通量,Cas A是最有可能的非热韧致辐射候选者。虽然它的n_e t约为2e 11 cm ^-3 s,但用目前的硬X射线探测器可以探测到100 keV以上的非热韧致辐射。

英文摘要:

I investigate the shape of the electron cosmic ray spectrum in the range up to ~1000 keV, assuming that the acceleration process at the shock results in a power law in momentum, and that downstream of the shock the spectrum is affected by Coulomb interactions with background electrons only. In the non-relativistic regime one can analytically determine the energy of an electron starting with a certain energy, and use this result to produce an electron cosmic ray spectrum, modified by Coulomb losses. An analytic expression for the electron spectrum is obtained that depends on the parameter n_e t, which can be estimated from a similar parameter used to characterize the line spectra of supernova remnants. For the brightest supernova remnants n_e t > 1e11 cm^-3 s,and most of the electrons accelerated to < 100 keV have lost their energy. Because of its high radio flux, Cas A is the most likely candidate for non-thermal bremsstrahlung. Although it has n_e t ~ 2e11 cm^-3 s, one may expect to pick up non-thermal bremsstrahlung above 100 keV with current hard X-ray detectors.

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