理论物理与天体物理研究所系列讲座之300:Radiation Properties of the Jets in AGNs: from the Core to Extended Regions

  • 2018年秋季


Speaker

张晋 博士, 中科院国家天文台

Title

Radiation Properties of the Jets in AGNs: from the Core to Extended Regions

Time & Venue

周四, 2018.09.20下午2:30, 物理楼573

Abstract

On the basis of a large sample of the observed spectral energy distributions (SEDs) and the leptonic jet model, we studied the jet radiation properties of AGNs at small and large scales. We found that: (1) the flat spectrum radio quasar (FSRQ) jets are highly magnetized with high radiation efficiencies while the BL Lac jets may be dominated by particles with low radiation efficiencies, and the narrow-line Seyfert 1 galaxy (NLS1) jets are intermediate between them; (2) GRB jets are highly magnetized with high radiation efficiency, similar to FSRQ jets; (3) the Eddington ratio may be the fundamental parameter to unify the BL Lac–NLS1–FSRQ sequence; (4) The luminosity ratio of radio to X-ray may be an indicator to distinguish between hotspots and knots in large-scale jets of AGNs. And the inverse Compton scattering of the cosmic microwave background process may be the origin for the high-energy emission in large-scale jets.

About the speaker

张晋博士于2009年在云南天文台获得博士学位,之后到广西师范学院工作,2011年到国家天文台做博士后研究,2013年博士后出站留在国家天文台工作。近几年,张晋博士主要从事伽玛射线辐射活动星系核相对论喷流物理性质的研究,包括辐射机制,喷流组分,喷流形成机制等等。今天她的报告题目是活动星系核喷流的辐射特征:从核区到大尺度的延展结构。