Abstract

The presented observation results of the blazar J0238+1636 were obtained in: 2014–2019 with the RATAN-600 radio telescope from the Special Astrophysical Observatory of the Russian Academy of Sciences at 2.3, 4.8, 8.2, 11.2, and 21.7 GHz; and 2015–2017 with the 32-m Zelenchuk and Badary radio telescopes of the Institute of Applied Astronomy of the Russian Academy of Sciences at 4.84 and 8.57 GHz. Two flares were detected on the long-term light curve. The time scale for variability on the rising branch of the first flare is τ_var = 0.5 year, and the upper limit for the linear and angular sizes of the emitting region at 21.7 GHz are 0.3 pc and 0.05 mas, respectively. The brightness temperature is T_b ≥ 2.6 × 10¹³ K, and the Doppler factor is δ ≥ 3. In three sets of the source’s daily observations, which lasted up to three months each, no significant variability on the day-to-day scale was found after subtracting the long-term variability. In the RT-32 data, the intraday variability (IDV) was found at a frequency of 4.84 GHz in three out of 15 sessions and at 8.57 GHz in two out of 13 sessions. The characteristic times for variability are 4−5 hours.

中文翻译：

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在2014-2019年使用RATAN-600和RT-32监视Blazar J0238 + 1636

摘要

提出的blazar J0238 + 1636的观测结果是在2014-2019年期间使用RATAN-600射电望远镜从俄罗斯科学院特别天体观测站以2.3、4.8、8.2、11.2和21.7 GHz获得的；和2015–2017年，使用俄罗斯科学院应用天文学研究所的32米Zelenchuk和Badary射电望远镜在4.84 GHz和8.57 GHz处发射。在长期光曲线上检测到两个耀斑。用于在第一耀斑的上升分支的变异的时间尺度是τ_变种= 0.5年，以及用于线性和发射区域的角度大小在21.7 GHz的上限分别为0.3 PC和0.05 MAS。亮度温度是Ť _b ≥2.6×10 ¹³K，并且多普勒因子为δ≥3。在源的三组日常观测中，每组持续长达三个月，减去长期变化后，在日常尺度上没有发现显着变化。在RT-32数据中，在15个时段中的3个时段中，​​频率为4.84 GHz，在13个时段中的2个时段中，​​频率为8.57 GHz。变异性的特征时间为4-5小时。