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arXiv 2009.05243astro-ph.GAastro-ph.CO
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一次潮汐破裂事件中铁发射对中心爆发的异常响应

An Extraordinary Response of Iron Emission to the Central Outburst in a Tidal Disruption Event Candidate

Zhicheng He, Ning Jiang, Tinggui Wang, Guilin Liu, Mouyuan Sun, Hengxiao Guo, Lu Shen, Zhenyi Cai, Xinwen Shu, Zhenfeng Sheng, Zhixiong Liang, Youhua Xu

摘要:

了解\feii \发射的起源对构建活动星系核(AGN)的主序列至关重要。尽管经过几十年的观测和理论研究,光学铁发射区的位置和\feii \强度与黑洞吸积率之间正相关的机制仍然是悬而未决的问题。在这封信中,我们报告了光学\feii \响应的中心爆发在PS 1 -10adi,一个候选的潮汐破裂事件(TDE)发生在活动星系核中的$z = 0.203$引起了广泛的关注。我们首次观察到\feii \响应在其中心光度的上升阶段比在下降阶段显著更突出,表现出滞后效应。我们解释这种滞后效应作为一个结果的尘埃颗粒逐渐升华位于内表面的环面成气体时,中央引擎的亮度增加。从升华的尘埃中释放出的铁元素对观测到的\feii \发射有明显的贡献。这种解释,连同我们观察到的\hb \发射的弱响应,自然地解释了相对\feii \强度作为爱丁顿比示踪剂的适用性。此外,这种起源的光学铁发射使\feii \时间滞后成为具有宇宙学意义的潜在“标准烛光”。

英文摘要:

Understanding the origin of \feii\ emission is important because it is crucial to construct the main sequence of Active Galactic Nuclei (AGNs). Despite several decades of observational and theoretical effort, the location of the optical iron emitting region and the mechanism responsible for the positive correlation between the \feii\ strength and the black hole accretion rate remain open questions as yet. In this letter, we report the optical \feii\ response to the central outburst in PS1-10adi, a candidate tidal disruption event (TDE) taking place in an AGN at $z = 0.203$ that has aroused extensive attention. For the first time, we observe that the \feii\ response in the rising phase of its central luminosity is significantly more prominent than that in the decline phase, showing a hysteresis effect. We interpret this hysteresis effect as a consequence of the gradual sublimation of the dust grains situating at the inner surface of the torus into gas when the luminosity of the central engine increases. It is the iron element released from the sublimated dust that contributes evidently to the observed \feii\ emission. This interpretation, together with the weak response of the \hb\ emission as we observe, naturally explains the applicability of relative \feii\ strength as a tracer of the Eddington ratio. In addition, optical iron emission of this origin renders the \feii\ time lag a potential "standard candle" with cosmological implications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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