| |  

| 首 页 | 机构概况 | 人才队伍 | 科研成果 | 实验室与中心 | 交流合作 | 研究生教育 | 党群园地 | | |
  邮箱用户登陆 @xao.ac.cn 密码
台长信箱
新闻动态
图片新闻
科研动态
综合新闻
通知公告
人才招聘
重大任务
科研专题
学术交流
会议承办
现在位置:时时彩网站 > 新闻动态 > 学术交流
“丝路天文”讲坛第十八讲: The most distant radio quasars - with the highest resolution
2019-05-22 10:00:00| 【 【打印】【关闭】
 

报告题目:The most distant radio quasars - with the highest resolution

人:Sándor Frey  Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest

报告摘要: I will start with a brief introduction of Konkoly Observatory, the largest astronomical research institution in Hungary. Then I review our current knowledge and summarize our most interesting recent results about radio-emitting active galactic nuclei (AGN) at the highest redshifts, observed with radio interferometry. Jetted AGN powered by accretion onto supermassive black holes (SMBHs) are rare and interesting objects by themselves, but are even more so at very high redshifts (z>4). They are associated with the youngest SMBHs formed in the early Universe. The most distant ones known to date are found above redshift 6 when the Universe was less than 1 billion years old. Radio-loud AGN at extremely high redshifts provide a unique insight into the AGN phenomena, the evolution of this class of objects on a cosmological time scale, and can even be used as probes of cosmological models. The technique of very long baseline interferometry (VLBI) offers the sharpest view of the innermost parts of the radio jets. Among the most interesting individual cases to be highlighted, I will mention the quasar J1026+2542 (z=5.27) whose jet proper motion could be measured, J1427+3312 (z=6.12) with a ~100-pc scale double structure reminiscent of very young compact symmetric objects, and a couple of puzzling sources which were initially thought to be blazars with relativistic jets pointing nearly to our line of sight, but recently turned out to be something completely different when imaged with high resolution.

报告人简介:

Sandor Frey graduated as an astronomer in 1991 and obtained his PhD degree in 2001, both at the Eotvos University in Budapest, Hungary. His main research fields are radio interferometry, VLBI studies of high-redshift quasars, dual active galactic nuclei, astrometry. For more than 25 years, he worked at the Satellite Geodetic Observatory of the former Institute of Geodesy, Cartography and Remote Sensing, where he was also involved in space geodesy projects. Since 2016, he is a senior research fellow at the Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences. Earlier he spent longer periods in Germany at the European Space Operations Centre, and in the Netherlands at the Joint Institute for VLBI in Europe. He has been giving radio astronomy lectures at the Eotvos University since 2003, and supervised more than 20 students. He is also active in science popularization and serves as a vice-president of the Hungarian Astronautical Society. From 2014 to 2017, he was a member of the European VLBI Network Program Committee.


报告地点:台本部南楼210会议室

 

报告时间:2019522日(周三)上午1030

 

作者:

附件:

欢迎访问中国科学院新疆天文台 © 2014 新ICP备14002045
地址:新疆乌鲁木齐市新市区科学一街150号 邮编:830011 电话:0991-3689007、3689002 传真:0991-3838628