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arXiv 2409.09265astro-ph.HE
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变化型活动星系核1ES 1927+654中的双区吸积盘:对潮汐瓦解事件与超爱丁顿吸积的物理启示

A Two-zone Accretion Disk in the Changing-look Active Galactic Nucleus 1ES 1927+654: Physical Implications for Tidal Disruption Events and Super-Eddington Accretion

Ruancun Li, Luis C. Ho, Claudio Ricci, Benny Trakhtenbrot

AI总结:

本研究分析变化型活动星系核1ES 1927+654的多历元宽带光谱能量分布,发现其吸积流含类薄盘中心过热区、外截断薄盘及高温冕,吸积率衰减符合潮汐瓦解特征,为薄盘存在提供观测证据并阐明其关键参数。

摘要:

薄盘(slim disk)吸积盘的性质虽对我们理解黑洞增长至关重要,但尚未得到广泛的观测研究。我们分析了变化型活动星系核1ES 1927+654的多历元宽带光谱能量分布,以推导其复杂的、随时间变化的吸积流性质。吸积率以$\dot{M} \propto t^{-1.53}$的速率衰减,与一颗$1.1\\\\,M_\odot$恒星的潮汐瓦解过程一致。光谱能量分布由三个成分贡献:一个类似薄盘的中心过热区、一个外部截断的薄盘(thin disk)以及一个高温冕。由初始高$\\\\

英文摘要:

The properties of slim accretion disks, while crucial for our understanding of black hole growth, have yet to be studied extensively observationally. We analyze the multi-epoch broad-band spectral energy distribution of the changing-look active galactic nucleus 1ES 1927+654 to derive the properties of its complex, time-dependent accretion flow. The accretion rate decays as $\dot{M} \propto t^{-1.53}$, consistent with the tidal disruption of a $1.1\, M_\odot$ star. Three components contribute to the spectral energy distribution: a central overheated zone resembling a slim disk, an outer truncated thin disk, and a hot corona. Photon trapping in the slim disk triggered by the high initial $\dot{M}$ was characterized by a low radiation efficiency ($3\%$), which later more than doubled ($8\%$) after $\dot{M}$ dropped sufficiently low for the disk to transition to a geometrically thin state. The blackbody temperature profile $T \propto R^{-0.60}$ for the inner overheated zone matches the theoretical expectations of a slim disk, while the effective temperature profile of $T \propto R^{-0.69}$ for the outer zone is consistent with the predictions of a thin disk. Both profiles flatten toward the inner boundary of the disk as a result of Compton cooling in the corona. Our work presents compelling observational evidence for the existence of slim accretion disks and elucidates the key parameters governing their behavior, paving the way for further exploration in this area.

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