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arXiv 2106.03059astro-ph.HE
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外观变化的AGN Mrk 1018的长期和多波长演化

Long-term and multi-wavelength evolution of a changing-look AGN Mrk 1018

Bing Lyu, Zhen Yan, Wenfei Yu, Qingwen Wu

摘要:

触发活动星系核变貌现象的物理机制至今仍不清楚。我们探索这个问题的基础上,在X射线,光学/紫外线(UV)和无线电波段的长期观测的变化看AGN Mrk~1018的多波长光谱和通量的变化。在2010- 2015年期间,光学和X射线辐射在变视相都经历了快速衰减,在光学/UV和X射线波段出现了再耀斑。我们发现在1.9型相位中,光学/UV在X射线变化之后的时间滞后为$\sim 20 $天。2016- 2017年5 GHz射电通量在1.9型阶段下降了$\sim 20$ \%。我们发现X射线光子指数($Γ$)和光-X射线光谱指数(\alphaox)与1.9型位相的2- 10 keV Eddington标度X射线光度($L_\mathrm{X}/L_\mathrm{Edd}$)都是反相关的。而第1类相位偏离了这两个反关联,这表明宽发射线的变化可能受吸积盘演化的调控(例如,在1.9型阶段内冷盘消失)。

英文摘要:

The physical mechanism for triggering the changing-look phenomenon in active galactic nuclei (AGNs) is still unclear. We explore this issue based on the multi-wavelength spectral and flux variations for a changing-look AGN Mrk~1018 with long-term observations in the X-ray, optical/ultraviolet(UV), and radio bands. Both the optical and the X-ray emission experience rapid decay in changing-look phase during 2010--2015, where a re-flare appears in the optical/UV and X-ray bands. We find a time lag of $\sim 20 $ days of optical/UV behind X-ray variations in type 1.9 phase. The 5 GHz radio flux decreases by $\sim 20$\% in type 1.9 phase during 2016--2017. We find both X-ray photon index ($Γ$) and the optical-to-X-ray spectral index (\alphaox\,) are anti-correlated with the Eddington scaled 2--10~keV X-ray luminosity ($L_\mathrm{X}/L_\mathrm{Edd}$) in the type 1.9 phase. However, the type 1 phase deviates from these two anti-correlations, which suggests that the change of broad emission lines might be regulated by the evolution of accretion disk (e.g., disappearing of the inner cold disk in the type 1.9 phase).

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