学术报告第189期：Outflows from super-critical accretion

星期四, 2020/11/26 - 15:00 to 16:30

稿件来源：Roberto Soria 发布人：网站管理员 编辑：珠海校区天琴中心2316会议室 发布日期：2020-11-26

主讲人 (Speaker): 

Roberto Soria

主讲人单位 (Speaker's Institute): 

中国科学院大学

邀请人 (Invited by): 

申荣锋

时间 (Time): 

星期四, 2020/11/26 - 15:00 to 16:30

地点 (Location): 

珠海校区天琴中心2316会议室

摘要 (Abstract): 

       Compact objects accreting above their Eddington limit should produce massive outflows and perhaps jets. Quantifying the mechanical power in the super-critical accretion regime is important as a test of theoretical models of disk structures, and of the effect of such powerful sources on their environment.  There are a small number of super-critical stellar-mass sources in the local universe (in particular, those known as "ultraluminous X-ray sources"): we are studying their multiband properties (X-rays, optical, radio) to identify signatures of outflows and measure their power. In particular, I will show examples of large shock-ionized bubbles around some of those sources, evidence of large-scale outflows. Many questions remain unanswered: can neutron stars produce outflows as powerful as black holes? When are jets formed, in addition to broad winds? are we missing a lot of super-critical sources shrouded by thick winds? what are the differences between super-critical accretion in stellar-mass objects and quasars?

主讲人简介 (Speaker's CV)：

Roberto Soria （中国科学院大学天文与空间科学学院，教授/博导）

Research field:  X-ray astronomy, 致密星吸积

(http://people.ucas.ac.cn/~0048826)

 

2017- now: Professor at UCAS                       

2011-2017: ICRAR-Curtin University Senior Research Fellow

2008-2010: Leverhulme Trust Early career fellow, University College London

2004-2007: Marie Curie International Fellow, Harvard-Smithsonian Center for Astrophysics

2000-2004: University College London, 博士后
1995-2000: Australian National University, PhD
1989-1994: University of Turin, 学士学位

代表性论文

  1. A pulsar's shocking power, Nature Astronomy, 2020, 第 1 作者
  2. Outbursts of the intermediate-mass black hole HLX-1: a wind instability scenario, MNRAS 2017, 第 1 作者
  3. From ultraluminous X-ray sources to ultraluminous supersoft sources: NGC 55 ULX, the missing link, MNRAS, 2017, 第 3 作者
  4. A mass of less than 15 solar masses for the black hole in an ultraluminous X-ray source, Nature, 2014, 第 3 作者
  5. Super-Eddington Mechanical Power of an Accreting Black Hole in M83, Science, 2014, 第 1 作者

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