THE ORIGIN OF MONOENERGETIC ELECTRONS IN THE ARC OF THE GALACTIC-CENTER - PARTICLE-ACCELERATION BY MAGNETIC RECONNECTION

被引：0
|
作者：
LESCH, H
REICH, W
机构：
[1] UNIV TORONTO, DEPT ASTRON, TORONTO M5S 1A1, ONTARIO, CANADA
[2] UNIV TORONTO, CANADIAN INST THEORET ASTROPHYS, TORONTO M5S 1A1, ONTARIO, CANADA
来源：
ASTRONOMY & ASTROPHYSICS | 1992年 / 264卷 / 02期
关键词：
GALACTIC CENTER; RADIO CONTINUUM EMISSION; PARTICLE ACCELERATION; GALACTIC NUCLEI;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Arc filaments in the Galactic Center exhibit an inverted radio spectrum with a spectral index alpha approximately 0.3 (S(nu) is-proportional-to nu(alpha)). Such a spectrum can be interpreted as optically thin synchrotron radiation from monoenergetic electrons. We propose magnetic reconnection as the acceleration process for these particles. Quantitative estimates are in agreement with the observed properties of the Arc. The motion of molecular clouds in a strong poloidal magnetic field serves as trigger mechanism for the magnetic reconnection process, which in general is likely an important acceleration process in galactic nuclei.
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页码：493 / 499
页数：7
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