Temporal X-ray astronomy with a pinhole camera
Temporal X-ray astronomy with a pinhole camera
复制标题
使用针孔相机进行时空 X 射线天文学
DOI：
10.1007/bf00645534
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发表时间：
1976
影响因子：
1.9
通讯作者：
S. Holt
中科院分区：
文献类型：
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作者：
S. Holt
第一个初步的结果从阿里尔-5全天X射线监视器，沿着足够的实验细节，以确定实验灵敏度。研究了三个来源的X射线发射的周期性调制，并与特定的周期相关联，结果证实了Cyg X-3的4.8小时变化，发现Cyg X-1的长期平均5.6天变化，没有观察到Sco X-1的0.787天调制。一致性的长期斯科X-1发射与“散粒噪声”模型进行了讨论，其中的源行为被证明是可解释为1000“耀斑”每天，每个持续时间为几个小时。在相对源稳定5个月后，1975年4月22日，天鹅座X-1的强度突然增加了近三倍。给出了三角座中一个明亮的类新星瞬变源的光变曲线，并与以前观测到的瞬变源进行了比较。提供了持续时间<1小时的X射线“爆发”存在的初步证据，但需要注意的是，目前还没有任何支持性证据来保证这种效应是真正的天文学效应。
The first preliminary results from the Ariel-5 All-Sky X-Ray Monitor are presented, along with sufficient experiment details to define the experiment sensitivity. Periodic modulation of the X-ray emission is investigated from three sources with which specific periods have been associated, with the results that the 4.8 h variation from Cyg X-3 is confirmed, a long-term average 5.6 day variation from Cyg X-1 is discovered, and no detectable 0.787 day modulation of Sco X-1 is observed. Consistency of the long-term Sco X-1 emission with a ‘shot-noise’ model is discussed, wherein the source behavior is shown to be interpretable as ∼ 100 ‘flares’ per day, each with a duration of several hours. A sudden increase in the Cyg X-1 intensity by almost a factor of three on 22 April, 1975 is reported, after 5 months of relative source constancy. The light curve of a bright nova-like transient source in Triangulum is presented, and compared with previously observed transient sources. Preliminary evidence for the existence of X-ray ‘bursts’ with duration <1 h is offered, with the caveat that there is not yet any supporting evidence to guarantee that the effect is truly astronomical.