Radio and X-Ray Variability of the Galactic Superluminal Source GRS 1915+105
Radio and X-Ray Variability of the Galactic Superluminal Source GRS 1915+105
复制标题
银河超光速源的射电和 X 射线变率 GRS 1915 105
DOI：
10.1086/310199
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
F. Ghigo
中科院分区：
文献类型：
--
作者：
R. Foster;E. Waltman;M. Tavani;B. A. Harmon;Shuang;W. Paciesas;F. Ghigo
本文报道了在1994年9月至1996年3月期间，用绿岸干涉仪和爆发和瞬变源实验对银河系超光速X射线源GRS 1915+105进行的射电和硬X射线观测结果。射电和硬X射线光曲线都显示出复杂的瞬变行为。在2.25 GHz和8.3 GHz监测到的射电发射与硬X射线发射增强的事件相关。射电发射的现象学分类表明有两种不同的发射模式：平台型和耀斑型。一般情况下，高原射电发射光学厚度很大，平顶的光曲线显示出通量密度的快速开始和下降。射电耀斑状态显示，大的射电耀斑可以在不到18小时的时间内使通量密度增加2个数量级，随后是光学细小的指数衰减。这些观测到的大型射电耀斑与发射同步辐射的等离子体外传播是一致的。我们评论了这些结果的意义，并提出了一个模拟GRS 1915+105多波长行为的方案。
We report results of radio and hard X-ray monitoring observations of the Galactic superluminal X-ray source GRS 1915+105 carried out with the Green Bank Interferometer and the Burst and Transient Source Experiment during the period 1994 September through 1996 March. Both the radio and the hard X-ray light curves show a complex transient behavior. The radio emission monitored at 2.25 and 8.3 GHz is correlated with episodes of enhanced hard X-ray emission. A phenomenological classification of the radio emission indicates two distinct emission modes: plateau and flaring. Plateau radio emission is in general optically thick, with a flat-topped light curve showing a rapid onset and decrease of the flux density. The radio flaring state shows large radio flares that can increase in flux density by 2 orders of magnitude in less than 18 hr, followed by an optically thin exponential decay. These observed large radio flares are consistent with external propagation of plasmoids emitting synchrotron radiation. We comment on the significance of these results, and suggest a scenario for modeling the multiwavelength behavior of GRS 1915+105.