Optical Variability of BL Lacertae during the Major Outburst of 1997
Optical Variability of BL Lacertae during the Major Outburst of 1997
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DOI：
10.1086/309071
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发表时间：
2000-07
期刊：
影响因子：
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通讯作者：
K. Ghosh;B. Ramsey;A. Sadun;S. Soundararajaperumal;J. Wang
中科院分区：
文献类型：
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作者：
K. Ghosh;B. Ramsey;A. Sadun;S. Soundararajaperumal;J. Wang
我们已经对BLLac的近期通量变化进行了研究。我们提供了22个晚上的光学观测，记录了大的和小的爆发。出于多频分析的目的，这已与已公布的额外一晚的X射线和γ射线数据结合在一起。特别是在两个晚上，包括X射线观测的那个晚上，记录到了大约一个完整变化幅度的大爆发。所有数据都用理论模型进行了分析。人们试图使用同步加速器自康普顿模型和外部康普顿化模型来解释数据；然而，这两类模型都被发现缺乏。用Wang等人提出的分析模型得到了较为满意的结果。考虑到爆发期间的辐射损失，这涉及到由于相对论电子的注入，均匀喷流中同步加速器光谱的演变。希望这项对BLLac的研究结果代表了一种更普遍的现象，适用于整个班级。
We have undertaken an investigation of recent flux variability in BL Lac. We present optical observations taken over 22 nights documenting major as well as minor outbursts. This has been combined, for purposes of multifrequency analysis, with published X-ray and γ-ray data taken for an additional single night. On two nights in particular, including the night of the X-ray observations, a major outburst of about a full magnitude of variation was recorded. All the data have been analyzed with theoretical models. Attempts were made to use synchrotron self-Compton and external Comptonization models to explain the data; however, both classes of models were found lacking. More satisfactory results were obtained using an analytical model proposed by Wang et al. that involves the evolution of synchrotron spectra in a homogeneous jet due to the injection of relativistic electrons, taking into account radiation losses during the outbursts. It is hoped that the results of this study of BL Lac, an archetype for the class of blazars in general, represent a more generic phenomenon applicable to the entire class.