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arXiv 2104.11097astro-ph.GA
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塞弗特星系NGC 3516中一个变貌事件的多波长监测和混响映射

Multi-Wavelength Monitoring and Reverberation Mapping of a Changing Look Event in the Seyfert Galaxy NGC 3516

V. L. Oknyansky, M. S. Brotherton, S. S. Tsygankov, A. V. Dodin, D. -W. Bao, B. -X. Zhao, P. Du, M. A. Burlak, N. P. Ikonnikova, A. M. Tatarnikov, A. A. Belinsk… 展开作者

V. L. Oknyansky, M. S. Brotherton, S. S. Tsygankov, A. V. Dodin, D. -W. Bao, B. -X. Zhao, P. Du, M. A. Burlak, N. P. Ikonnikova, A. M. Tatarnikov, A. A. Belinski, A. A. Fedoteva, N. I. Shatsky, E. O. Mishin, S. G. Zheltouhov, S. A. Potanin, J. -M. Wang, J. N. McLane, H. A. Kobulnicky, D. A. Dale, T. E. Zastrocky, J. Maithil, K. A. Olson, C. Adelman, Z. Carter, A. M. Murphree, M. Oeur, S. Schonsberg, T. Roth

摘要:

我们介绍了2018年至2020年进行的AGN NGC 3516的光度和光谱监测活动的结果,涵盖了从X射线到光学的波长范围。这些设施包括CMO SAI MSU的望远镜,2.3米WIRO望远镜以及Swift的XRT和UVOT。我们发现NGC 3516在2020年春末变得明亮,可以归类为Sy1.5。我们已经测量了Balmer和He II 4686线对连续变化的响应中的时间延迟。在最佳表征的宽H-β谱线的情况下,蓝翼的连续变率延迟约为17天,而红翼明显更短,为9天,这表明流入。随着宽谱线的增强,蓝边开始主导巴耳末谱线,导致在这种高状态下具有蓝移峰的非常不对称的轮廓。在爆发期间,X射线通量在2020年4月1日达到最大值,这是雨燕天文台观测到的NGC 3516的最高值。X射线硬光子指数变得更软,2020年4月21日最大值约为1.8,而2020年之前的早期时期平均值约为0.7。我们发现,直到2020年4月初,紫外线和光学变化与X射线的相关性很好(有1 - 2天的小时间延迟),但后来,直到2020年6月底,这些变化都没有相关性。我们认为,这一事实可能是由于康普顿厚的云层穿过视线造成的部分遮蔽的结果。

英文摘要:

We present the results of photometric and spectroscopic monitoring campaigns of the changing look AGN NGC 3516 carried out in 2018 to 2020 covering the wavelength range from the X-ray to the optical. The facilities included the telescopes of the CMO SAI MSU, the 2.3-m WIRO telescope, and the XRT and UVOT of Swift. We found that NGC 3516 brightened to a high state and could be classified as Sy1.5 during the late spring of 2020. We have measured time delays in the responses of the Balmer and He II 4686 lines to continuum variations. In the case of the best-characterized broad H-beta line, the delay to continuum variability is about 17 days in the blue wing and is clearly shorter, 9 days, in the red, which is suggestive of inflow. As the broad lines strengthened, the blue side came to dominate the Balmer lines, resulting in very asymmetric profiles with blueshifted peaks during this high state. During the outburst the X-ray flux reached its maximum on 1 April 2020 and it was the highest value ever observed for NGC 3516 by the Swift observatory. The X-ray hard photon index became softer, about 1.8 in the maximum on 21 Apr 2020 compared to the mean about 0.7 during earlier epochs before 2020. We have found that the UV and optical variations correlated well (with a small time delay of 1-2 days) with the X-ray until the beginning of April 2020, but later, until the end of Jun. 2020, these variations were not correlated. We suggest that this fact may be a consequence of partial obscuration by Compton-thick clouds crossing the line of sight.

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