《通過研究輻射傳輸了解黑洞周邊極端吸積與溢流》研討會


Public Seminar of PhD Candidate:- Understanding Extreme Accretion and Outflows around Black Holes through Radiative Transfer Studies

Accretion of matter onto black holes regulates their growth. During the accretion process, a significant portion of the matter can be expelled as powerful outflows, which impact the surrounding environment. Therefore, the interplay between accretion and outflow is crucial for many astrophysical phenomena and processes, such as the AGN feedback regulating the co-evolution between galaxies and massive black holes. In his PhD work, the speaker focuses on studying the outflows produced when the accretion rate onto the black hole is very high, and he aims to connect their theoretical Modelling to observable properties.

The speaker introduces a comprehensive theoretical model that captures X-ray reverberation signatures within a realistic extreme accretion geometry. This model reveals unique observational features of iron(Fe) lines generated by extreme accretion flows, contrasting them with those originating from standard accretion flows. Notably, the Fe lines exhibit pronounced blueshifts in energy, more symmetric line profiles, and significantly shorter time lags. He also examines the continuum emission from extreme accretion flows, such as Tidal Disruption Events(TDEs). His work demonstrates that the spectral energy distribution of TDEs depends on the observer’s inclination and the accretion rate, which explains their observed diversity and dynamic evolution.

時間:2023.08.24(四) 10:00
地點:香港大學 莊月明物理樓522室;或
頻道:Zoom ID: 964-7070-4221 ← 834728
講者:Lars Lund THOMSEN (香港大學)
語言:英語

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【此屬轉載訊息,以主事單位發佈為準】

此活動由香港大學物理系.PhD主辦。

https://www.physics.hku.hk/event/coming/20230824-llt

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