Intraday optical variability of the BL Lacertae object S5 0716+714

Intraday optical variability of the BL Lacertae object S5 0716+714
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BL Lacertae 天体 S5 0716 714 的日内光学变化

DOI:
10.1111/j.1365-2966.2012.20533.x
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发表时间:
2012-04
影响因子:
4.8
通讯作者:
Cao, Z.
Cao, Z.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang, B. K.;Dai, B. Z.;Wang, L. P.;Zhao, M.;Zhang, L.;Cao, Z.

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使用历史光变曲线研究了 BL Lacertae 天体 S5 0716+714 的日内光学变化。选择采样良好的夜间数据集。 208 个夜晚总共收集了 19 333 个数据点。光源在光波段表现出很强的可变性。在 99.9% 的置信水平下,208 个夜晚中的 162 个夜晚,源显示出夜间变化。观测期间震源以0.043 mag h-1的增加速率和0.036 mag h-1的减少速率变化,上升和下降部分没有明显差异。 JD 245 1909 发现了快速变化,6 分钟内下降率为 0.015 mag min-1。采用结构函数方法研究时间特性。结果表明,源在 11.5 分钟的时间尺度内变化。对于这个源,发射尺寸估计为 1.39 x 1014 cm,中心黑洞的质量估计为 107.87 M?磁场强度估计为10.6 G。
The intraday optical variability of the BL Lacertae object S5 0716+714 is studied using historical light curves. The well-sampled intranight data set is selected. In total, 19 333 data points have been collected over 208 nights. The source exhibits strong variability in the optical band. At a confidence level of 99.9 per cent, for 162 of the 208 nights the source shows intranight variability. The source varies with an increasing rate of 0.043 mag h-1 and a decreasing rate of 0.036 mag h-1 during the observations, with no evident difference between rising and falling parts. The fast variability is found on JD 245 1909, with a decreasing rate of 0.015 mag min-1 over 6 min. The temporal characteristic is studied by using the structure function method. The result shows that the source varies with an 11.5-min time-scale. For this source, the emission size is estimated to be 1.39 x 1014 cm, the mass of the central black hole is estimated to be 107.87 M? and the magnetic field strength is estimated to be 10.6 G.
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