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来自ASASSN-15oi的八年之光:迈向理解TDEs的晚期演化

Eight Years of Light from ASASSN-15oi: Towards Understanding the Late-time Evolution of TDEs

A. Hajela, K. D. Alexander, R. Margutti, R. Chornock, M. Bietenholz, C. T. Christy, M. Stroh, G. Terreran, R. Saxton, S. Komossa, J. S. Bright, E. Ramirez-Ruiz,… 展开作者

A. Hajela, K. D. Alexander, R. Margutti, R. Chornock, M. Bietenholz, C. T. Christy, M. Stroh, G. Terreran, R. Saxton, S. Komossa, J. S. Bright, E. Ramirez-Ruiz, D. L. Coppejans, J. K. Leung, Y. Cendes, E. Wiston, T. Laskar, A. Horesh, G. Schroeder, Nayana A. J., M. H. Wieringa, N. Velez, E. Berger, P. K. Blanchard, T. Eftekhari, S. Gomez, M. Nicholl, H. Sears, B. A. Zauderer

AI总结:

本文报告了潮汐瓦解事件ASASSN-15oi长达约8年的多波长后续观测结果,揭示了其晚期热与非热辐射的复杂演化特征,并强调长期监测对理解TDE演化的重要性。

摘要:

我们展示了潮汐瓦解事件(TDE)ASASSN-15oi的广泛后续观测活动结果,时间跨度为δt ~ 10 - 3000 d,为TDE在首个约8年演化期间的多波长特性提供了前所未有的窗口。ASASSN-15oi是少数在X射线、光学/UV和射电波段都有强探测的TDE之一,并在δt ~ 180 d和δt ~ 1400 d时出现了两次延迟的射电耀发。我们在> 1400 d的观测揭示了热X射线的缺失、非热X射线辐射的晚期变率,以及非热X射线和射电辐射分别在δt ~ 2800 d和~ 3000 d时的急剧下降。UV辐射在> 400 d时未显示出显著演化,并保持在TDE发生前的水平之上。我们表明,冷却包层模型能够一致地解释所有时期的热辐射。我们还发现,由流-流碰撞引起的物质间歇性抛射场景有利于解释第一次射电耀发。然而,鉴于晚期辐射的特殊光谱和时间演化,约束第二次射电耀发和非热X射线的起源仍然具有挑战性。我们的研究强调了长期、多波长后续观测的关键作用。

英文摘要:

We present the results from an extensive follow-up campaign of the Tidal Disruption Event (TDE) ASASSN-15oi spanning $δt \sim 10 - 3000$ d, offering an unprecedented window into the multiwavelength properties of a TDE during its first $\approx 8$ years of evolution. ASASSN-15oi is one of the few TDEs with strong detections at X-ray, optical/UV, and radio wavelengths and featured two delayed radio flares at $δt \sim 180$ d and $δt \sim 1400$ d. Our observations at $> 1400$ d reveal an absence of thermal X-rays, a late-time variability in the non-thermal X-ray emission, and sharp declines in the non-thermal X-ray and radio emission at $δt \sim 2800$ d and $\sim 3000$ d, respectively. The UV emission shows no significant evolution at $>400$ d and remains above the pre-TDE level. We show that a cooling envelope model can explain the thermal emission consistently across all epochs. We also find that a scenario involving episodic ejection of material due to stream-stream collisions is conducive to explaining the first radio flare. Given the peculiar spectral and temporal evolution of the late-time emission, however, constraining the origins of the second radio flare and the non-thermal X-rays remains challenging. Our study underscores the critical role of long-term, multiwavelength follow-up.

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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