Title: Relativistic Line Reverberation Mapping in Tidal Disruption Events and Early Phase Discovery

Speaker: 余文飞 研究员
Institute: 上海天文台(SHAO)
Time: 2017.10.26（Thursday） 14:30
Place: Physics Building 573, Haiyun Campus, Xiamen University

Abstract: When normal stars run close enough to the previously dormant supermassive black holes (SMBHs) at the centres of normal galaxies, they would be entirely or partly disrupted due to the tidal force, leading to the so-called tidal disruption events (TDEs). Part of the debris material will be accreted by the SMBHs later on. The accretion of the debris material would generate X-ray or UV flares, which will illuminate the remaining fresh debris material and would generate spectral line feature in their spectra. Here we show predicted features of relativistic spectral line expected to occur during the accretion phase of the debris material. We demonstrate that these spectral features can be used to probe the mass and spin of the SMBHs at the centres of galaxies as well as the accretion geometry involved in the TDE events. Furthermore, future large field-of-view monitoring or survey telescopes in the radio band, such as the Square Kilometer Array (SKA), will be able to detect nuclear activities due to tidal disruption of stars in the very early phase, allowing future space observatories to respond quick enough to observe these relativistic spectral lines.