题目: Super-Eddington Accretion Flow in Narrow-line Seyfert 1 Galaxies

报告人: 金驰川 研究员, 中科院国家天文台

时间地点: 周四, 2019.3.28下午2:30-4:30, 物理楼552

Abstract:

The most powerful accretion and radiation processes in the Universe can be found in super-Eddington AGN. Among them, super-Eddington Narrow-line Seyfert 1 Galaxies (NLS1s) are the most ideal targets for observations with current instruments. This is because they are both bright and highly variable, and so can provide high-quality data for detailed investigation of the accretion flow. In this talk, I will present multi-wavelength spectral-timing properties and the broadband spectral energy distribution of super-Eddington NLS1s. I will show that these observational results can be explained in a unified accretion flow scenario, which contains a standard outer disc, a puffed-up inner disc with strong disc wind and/or advection (which suppresses the radiation efficiency), an extended soft X-ray corona region, and a compact hard X-ray corona region. By considering the inclination angle effect, such a scenario has the potential to explain the X-ray complexity of all super-Eddington NLS1s, without requiring a large spin parameter. I will also show that super-Eddington NLS1s are most likely to be the low-redshift analogies of super-Eddington quasars at high redshifts. Finally, I will mention future observations that can deepen our understanding about the super-Eddington accretion flow in AGN.