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arXiv 0809.2432astro-ph
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银河系Ia型超新星遗迹的逆康普顿gamma-ray模型?

Inverse Compton gamma-ray models for remnants of Galactic type Ia supernovae?

H. J. Voelk, L. T. Ksenofontov, E. G. Berezhko

摘要:

我们从理论上和唯象上研究了Ia型超新星SN 1006、第谷超新星SN和开普勒超新星SN的残余物的γ射线发射是否可以仅仅是电子加速的结果。观测到的三个残留物的同步辐射光谱被用来确定作为假设的磁场强度的函数的非热电子的平均动量分布。然后计算了宇宙微波背景光子场中的逆康普顿发射光谱,并与这些源的甚高能γ射线通量的现有上限进行了比较。结果表明,预期的星际磁场大大高估甚至这些伽马射线的上限。只有相当强的放大磁场才能与如此低的伽马射线通量兼容。然而,这将需要加速的核粒子的强分量,其能量密度大大超过同步加速器电子的能量密度,与核粒子和电子的现有理论加速模型兼容。尽管定量的论证过于简单,但它们似乎排除了过于简单的现象学主张,而支持这些源的逆康普顿伽马射线场景。

英文摘要:

We theoretically and phenomenologically investigate the question whether the gamma-ray emission from the remnants of the type Ia supernovae SN 1006, Tycho's SN and Kepler's SN can be the result of electron acceleration alone. The observed synchrotron spectra of the three remnants are used to determine the average momentum distribution of nonthermal electrons as a function of the assumed magnetic field strength. Then the inverse Compton emission spectrum in the Cosmic Microwave Background photon field is calculated and compared with the existing upper limits for the very high energy gamma-ray flux from these sources. It is shown that the expected interstellar magnetic fields substantially overpredict even these gamma-ray upper limits. Only rather strongly amplified magnetic fields could be compatible with such low gamma-ray fluxes. However this would require a strong component of accelerated nuclear particles whose energy density substantially exceeds that of the synchrotron electrons, compatible with existing theoretical acceleration models for nuclear particles and electrons. Even though the quantitative arguments are simplistic, they appear to eliminate simplistic phenomenological claims in favor of a inverse Compton gamma-ray scenario for these sources.

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