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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2011.04074astro-ph.HEastro-ph.SR
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不同时间尺度上光学范围内TeV blazar PG 1553+113的多波段行为

Multi-band behaviour of the TeV blazar PG 1553+113 in optical range on diverse timescales

A. Agarwal, B. Mihov, I. Andruchow, Sergio A. Cellone, G. C. Anupama, V. Agrawal, S. Zola, L. Slavcheva-Mihova, Aykut Ozdonmez, Ergun Ege, Ashish Raj, Luis Mamm… 展开作者

A. Agarwal, B. Mihov, I. Andruchow, Sergio A. Cellone, G. C. Anupama, V. Agrawal, S. Zola, L. Slavcheva-Mihova, Aykut Ozdonmez, Ergun Ege, Ashish Raj, Luis Mammana, L. Zibecchi, E. Fernández-Lajús

摘要:

上下文TeV BL Lac天体PG 1553+113是双超大质量黑洞系统的主要候选者之一。目的。我们研究了PG 1553+113在夜间到长期时间尺度上的通量和光谱变化,使用(i)从2016年1月到2019年8月收集的76个夜晚的BVRI数据,涉及9个光学望远镜和(ii)从2005年到2019年获得的历史VR数据(包括我们的)。方法.我们使用各种统计测试,拟合和互相关技术,以及寻找周期性的方法分析了光变曲线。我们检查了相应的光变曲线校正长期变化之前和之后的颜色星等图。结果我们的夜间监测,辅以文献数据,结果在~(10-18)%的低占空比。2019年4月,我们记录到了一个耀斑,它标志着PG 1553+113在2005年至2019年期间最亮的状态:R = 13.2 mag.这个耀斑被发现在其VR颜色-星等图上显示出顺时针的光谱滞后环,并且在V波段变化领先于R波段变化的意义上存在时滞。我们得到的半径,磁场强度,和电子能量的估计,表征发射区域有关的耀斑。我们发现使用历史光变曲线的中位周期为(2.21 +/- 0.04)年。此外,我们检测到的第二个周期约210天的历史光变曲线校正的长期变化。我们简要讨论了这一时期的可能起源。

英文摘要:

Context. The TeV BL Lac object PG 1553+113 is one of the primary candidates for a binary supermassive black hole system. Aims. We study the flux and spectral variability of PG 1553+113 on intra-night to long-term timescales using (i) BVRI data collected over 76 nights from January 2016 to August 2019 involving nine optical telescopes and (ii) historical VR data (including ours) obtained for the period from 2005 to 2019. Methods. We analysed the light curves using various statistical tests, fitting and cross-correlation techniques, and methods for the search for periodicity. We examined the colour-magnitude diagrams before and after the corresponding light curves were corrected for the long-term variations. Results. Our intra-night monitoring, supplemented with literature data, results in a low duty cycle of ~(10-18)%. In April 2019, we recorded a flare, which marks the brightest state of PG 1553+113 for the period from 2005 to 2019: R = 13.2 mag. This flare is found to show a clockwise spectral hysteresis loop on its VR colour-magnitude diagram and a time lag in the sense that the V-band variations lead the R-band ones. We obtain estimates of the radius, the magnetic field strength, and the electron energy that characterize the emission region related to the flare. We find a median period of (2.21 +/- 0.04) years using the historical light curves. In addition, we detect a secondary period of about 210 days using the historical light curves corrected for the long-term variations. We briefly discuss the possible origin of this period.

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