Title:  

高红移射电类星体的高分辨率观测研究

High-resolution observational study of high-redshift radio quasars

Speaker: Tao An, Shanghai Astronomical Observatories, Chinese Academy of Sciences

Host: Junfeng Wang

Time: 14:30, Thursday, Nov. 5

Location: Physics Building 552

Abstract: 

类星体是宇宙中亮度最高的持续发光的一类天体，在天体物理和天体测量等多个领域都有重要的科学研究价值。目前观测到最高红移的类星体达到7.5，接近于宇宙再电离的尾声，因此观测研究高红移类星体对于理解第一代超大黑洞的生长模式、动力学性质及其星际环境有重要意义。射电喷流是黑洞活跃性的一个表征，从半个多世纪前发现类星体开始，射电波段的测量就一直在研究类星体方面发挥着至关重要的作用。通过射电喷流可以直接研究黑洞的吸积和反馈，也为认识早期宇宙中的喷流物理过程提供独特的见解。在这个报告中，将重点介绍高红移射电类星体的观测研究进展，并提出了该领域的未决问题。

Quasars are the brightest persistent objects in the Universe and have important scientific research value in many fields such as astrophysics and astrometry. At present, the highest redshift quasar has been observed to be 7.5, which is close to the end of cosmic reionization. Therefore, the observation and study of high redshift quasars are of great significance for understanding the growth mode, dynamics, and interstellar environment of the first generation of supermassive black holes. Radio jets are directly connected to the black hole activity, and radio-band measurements have played a crucial role in the study of quasars since their discovery more than half a century ago. The radio jets allow direct study of black hole accretion and feedback, and also provide unique insights into the understanding of the physical processes of the AGN jets in the early Universe. In this presentation, progress in observational studies of high-redshift radio quasars is highlighted, and outstanding questions in this field are raised.

Bio: 

安涛研究员于2004年在上海天文台获得天体物理博士学位，之后在上海天文台工作至今。现任射电天文科学与技术研究室副主任。主要研究领域包括活动星系核、暂现源、射电天文技术与方法，近期在高红移类星体和暂现源的高分辨率观测研究中取得了一些进展。担任SKA区域中心委员会中方代表，建成中国SKA区域中心原型机，将人工智能技术用于天文大数据处理取得显著成果。