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喷流潮汐破坏事件中冠状半径参数的时变性:Swift J1644+57

Temporal Variation of the Coronal Radius Parameter in a Jetted Tidal Disruption Event: Swift J1644+57

University of Manitoba(曼尼托巴大学);Chungbuk National University(忠北国立大学);Aoyama Gakuin University(青山学院大学);Physical Research Laboratory(物理研究实验室);Indian Centre for Space Physics(印度空间物理中心);Indian Institute of Astrophysics(印度天体物理研究所);INAF-IASF Palermo(意大利国家天体物理研究所巴勒莫天体物理研究所);University of British Columbia(不列颠哥伦比亚大学);SRM University-AP(SRM大学安得拉邦校区)

Arka Chatterjee, Kimitake Hayasaki, Prantik Nandi, Neeraj Kumari, Skye R. Heiland, Arghajit Jana, Sachindra Naik, Samar Safi-Harb

AI总结:

研究喷流潮汐破坏事件中冠状半径参数的时变性,通过分析Swift/XRT和XMM-Newton观测数据,发现谱指数非单调下降,软硬X射线光子计数高度相关,表明冠状体可能为Compton云,其半径参数随时间变化符合理论推测。

摘要:

潮汐破坏事件是恒星或星际介质被超大质量黑洞捕获的罕见天体物理现象。该过程在几个月到一年的时间尺度内释放出巨大的能量,足以探测近处和遥远星系中的沉睡黑洞。我们重新审视喷流潮汐破坏事件\source的长期谱变异性,通过Swift/XRT和XMM-Newton观测档案数据进行分析。我们的分析发现,随着\source随时间演化,谱指数非单调下降。我们还发现软(0.3-1.5 keV)和硬(1.5-10 keV)X射线光子计数高度相关,相关系数最高达0.95,峰值出现在零滞后。此外,XMM-Newton观测得到的软和硬波段变异性具有高度相关性,皮尔逊交叉相关系数为0.96。这表明软和硬X射线光子来自同一地点,最可能是Compton云,即冠状体。假设硬X射线光子来自冠状体,我们发现冠状参数在早期阶段伴随相对论喷流发射时迅速膨胀,随后演变为饱和状态,后期有微小波动。冠状半径参数(R_cor)的时间变化与简单理论推测一致。我们还讨论了我们的分析结果在其他喷流和非喷流潮汐破坏事件中的应用。

英文摘要:

Tidal Disruption Events are exotic astrophysical phenomena where matter from a star or the interstellar medium is captured by a supermassive black hole. The process liberates enormous energy, within a few months to a year timescale, enough to detect dormant black holes in near as well as the farthest galaxies. We revisit the long-term spectral variabilities associated with the jetted Tidal Disruption Event \source~by exploring the archival X-ray data obtained with Swift/XRT and XMM-Newton observatories. Our analysis reveals that the spectral indices decrease non-monotonically as \source~evolves with time. We also find that the soft (0.3-1.5 keV) and hard (1.5-10 keV) X-ray photon counts are highly correlated with a maximum correlation coefficient of 0.95 and peak at {\it zero} lag. Moreover, the soft and hard band variabilities obtained from XMM-Newton observations are highly correlated with a Pearson cross-correlation coefficient of 0.96. This indicates that the soft and hard X-ray photons are emitted from the same site, which is most likely a Compton cloud, i.e., the corona. Assuming the hard X-ray photons originate from the corona, we find that the coronal parameter undergoes rapid expansion during the early phases when accompanied by a relativistic jet launching and subsequently evolves toward a state of saturation with minor fluctuations in the latter stages. The temporal variation of the coronal radius parameter ($R_{cor}$) is consistent with a simple theoretical conjecture. We also discuss the application of our analytical outcomes to other jetted and non-jetted tidal disruption events.

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