arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.2435astro-ph.HE
收藏

地球同步辐射X射线探测初级宇宙电子能谱高能端的可行性研究

Feasibility study of probing the high energy end of the primary cosmic electron spectrum by detecting geo-synchrotron X-rays

Y. Akaike, K. Kasahara, R. Nakamura, S. Ozawa, Y. Shimizu, S. Torii, K. Yoshida, T. Tamura, S. Udo

摘要:

基于对一个用于观测初级电子产生的同步辐射硬X射线的探测器的测试,我们研究了探测能量在几TeV到10 TeV以上的宇宙电子的可行性。这样的高能电子被认为是地球附近的来源的证据(例如超新星遗迹,如船帆座:年龄< ~10^5年,位于<~ 1 kpc)。这个想法本身是相当古老的;一个高能电子在地磁场中连续发射同步加速器X射线,从而产生几个在米尺度上排列的X射线。这一特征为克服其他传统观测方法中遇到的背景问题提供了一条线索。我们严格审查这种方法的可行性,假设卫星高度观测,并发现,这是很难得到一个精确的能谱的电子,但有可能得到一个明确的信号的存在,几个TeV的电子,如果通量是由一类合理的模型预测的水平相媲美。对于这样的观测,需要大于1 m^2年的曝光量。将本方案应用于伽马射线暴的观测是很有吸引力的。

英文摘要:

Based on tests of a tentative detector for observing geo-synchrotron hard X-rays generated by primary electrons, we study the feasibility of probing cosmic electrons above a few TeV to over 10 TeV. Such high energy electrons are expected to give proof of sources near the Earth (e.g. supernova remnants such as Vela: age < ~10^5 years located within <~1kpc). The idea itself is rather old; a high energy electron emits synchrotron X-rays successively in the geomagnetic field and thus gives several X-rays aligned on a meter scale. This feature is a clue to overcome the background problem encountered in other traditional observation methods. We critically examine the feasibility of this approach assuming a satellite altitudes observation, and find that it is difficult to derive a precise energy spectrum of electrons but is possible to get a clear signal of the existence of several TeV electrons if the flux is comparable to the level predicted by a class of plausible models. For such observations, an exposure >1 m^2year would be needed. It would be attractive to incorporate the present scheme in the gamma-ray burst observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑