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首页> 外文期刊>Astrophysics and space science >Variable synchrotron emission from BL Lacertae objects. II. Optical and X-ray flares in HBL source 1ES 1959+650
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Variable synchrotron emission from BL Lacertae objects. II. Optical and X-ray flares in HBL source 1ES 1959+650

机译：BL Lacertae对象的可变同步加速器发射。二。 HBL光源1ES 1959 + 650中的光学和X射线耀斑

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This paper presents the results of the optical R band and 1.5-12 keV band X-ray monitoring of the high-energy peaked BL Lacertae source 1ES 1959+650 performed during 2002-2007 with the 70 cm Meniscus Telescope of Abastumani Astrophysical Observatory (Georgia) and the All-Sky Monitor on board the Rossi X-ray Time Explorer, respectively. The observed long- and short-term outbursts are fitted with the lightcurves obtained by means of the modeling of synchrotron flares that are assumed to be the result of a propagation of the relativistic shock waves through the jet of 1ES 1959+650, pointed to the observer. Different values of the input parameters (shock velocity, particles' spectral index, sizes of emission region, minimum and maximum Lorentz factors of the particles etc.) are used in order to fit the simulated lightcurves whose constructed by means of observational data. This investigation shows that both shock velocity and physical conditions in the jet of 1ES 1959+650 should be variable from flare to flare. The shocks are found to be mildly relativistic with the apparent speeds β=0.46-0.85, expressed in the units of c. Spectral index of the particle energy distribution varied from 2.10 to 2.17 for the long-term flares while it is higher in the case of short-term outbursts: s=2.32-2.45 that is suggested to be a result of the deceleration of shock front during its passage through the shell situated downstream the Mach disc. The average strength of a turbulent magnetic field ranged from 0.025 gauss to 0.04 gauss for different long-term flares while the values of 0.07-0.14 gauss were adopted for the different short-term outbursts. The lengths of variable jet area found to be of 0.13-0.47 pc with the transverse extents of (0.5-1.0)×10 ~(17) cm in the case of long-term flares. The same characteristics for short-term outbursts were (2.74-5.5)×10 ~(16) cm and (0.2-04)×10 ~(17) cm, respectively. We conclude that both shock velocity and properties of pre-shocked plasma were not the same in 1ES 1959+650 for the different flaring epochs.
机译：本文介绍了在2002-2007年期间用70厘米的阿巴斯图曼尼天文观测台（美国乔治亚州）弯月形望远镜执行的高能峰BL蝎形天牛源1ES 1959 + 650的光学R波段和1.5-12 keV波段X射线监测结果）和Rossi X射线时间浏览器上的全天候监控器。观测到的长期和短期爆发都与通过同步加速器耀斑建模获得的光曲线相吻合，这些曲线被认为是相对论冲击波通过1ES 1959 + 650射流传播的结果。观察者。输入参数的不同值（冲击速度，粒子的光谱指数，发射区域的大小，粒子的最小和最大洛伦兹因子等）用于拟合通过观察数据构造的模拟光曲线。这项研究表明，在1ES 1959 + 650喷气机中，冲击速度和物理条件都应随火炬而变化。发现冲击与表观速度β= 0.46-0.85相对温和，以c为单位表示。对于长期耀斑，粒子能量分布的光谱指数在2.10到2.17之间变化，而在短期爆发情况下则更高：s = 2.32-2.45，这是由于在爆炸过程中激波锋的减速所致它穿过位于马赫圆盘下游的外壳。对于不同的长期爆发，湍流磁场的平均强度在0.025高斯至0.04高斯之间，而对于不同的短期爆发，则采用0.07-0.14高斯的值。在长期爆发的情况下，可变射流区域的长度为0.13-0.47 pc，横向范围为（0.5-1.0）×10〜（17）cm。短期爆发的相同特征分别为（2.74-5.5）×10〜（16）cm和（0.2-04）×10〜（17）cm。我们得出的结论是，在1ES 1959 + 650中，对于不同的燃烧时期，冲击速度和预震荡等离子体的特性都不相同。

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