今天是   收藏本站 | 联系我们 | 上海天文台 | English
首页 研究领域 研究团组 科研人员 学术活动 工作机会 内部信息
  每周简讯
 
04/06/2018-08/06/2018

SHAO Astrophysics Colloquium

TitleGalaxy formation in the context of concordance cosmology: confront theory with observations 

Speaker: Qi Guo (National Astronomical Observatories, CAS.)

Time: 3:30 pm, June 07 (Thursday)

Location: Lecture Hall, 3rd floor

Abstract:

It has made great progress in the field of galaxy formation and cosmology in the past 30 years. Here I will highlight recent progresses  and challenges in galaxy formation models, by comparing model predictions with observations.  In particular, I will also present our recent work to use galaxy formation models to explain the formation of a special population of dwarf galaxies, the ultra-diffuse dwarf galaxies (UDG). The UDGs have luminosity of typical dwarf galaxy but with sizes as large as typical L* galaxies.  They are preferentially discovered in high dense region, yet lack of tidal features.  A great attention has been drawn on the origin of this population. I will show that the UDGs are genuine dwarf galaxies rather than failed L* galaxies.

Seminar

Title: Understanding the X-ray and Multi-wavelength Spectral Variability of super-Eddington NLS1s

Speaker: Chichuan Jin (NAOC)

Time: 10:45 am, June 8 (Friday)

Location: Middle conference room, 3rd floor

Abstract: The study of multi-wavelength spectral variability can provide global constraints on the accretion flow around SMBH. For several years we have been using observational data from various instruments, especially XMM-Newton, to study the multi-wavelength properties of super-Eddington NLS1s. These studies greatly deepen our understanding about AGN accretion. In this presentation, I will talk about general multi-wavelength (especially X-ray) spectral timing properties of unobscured super-Eddington NLS1s, which can be well understood in a unified accretion flow scenario, which contains a standard outer disc, a puffed-up inner disc with strong disc wind and/or advection, an extended soft X-ray corona region and a compact hard X-ray corona region. By considering the inclination angle effect, such a scenario can explain NLS1s with more complex X-ray properties, without requiring a large spin parameter. These results also highlight the requirements for future multi-wavelength simultaneous spectral-timing monitoring programs in order to make further breakthroughs in the study of AGN accretion.

Group meetings

Black hole Accretion and High-energy Astrophysics /Black Hole Feedback and Cosmic Ray Astrophysics Seminar

Location: 1608

Time: 14:00-16:00, Wednesday, June 6

Speaker: Zhiyuan Yao

The Effect of the AGN Feedback on the Interstellar Medium of Early-Type Galaxies: 2D Hydrodynamical Simulations of the Low-Rotation Case

https://ui.adsabs.harvard.edu//#abs/2017ApJ...835...15C

Speaker: Gleniese McKenzie

Blazar Variability from Turbulence in Jets Launched by Magnetically Arrested Accretion Flows

https://ui.adsabs.harvard.edu/?#abs/2017ApJ...843...81O

Active Galactic Nuclei Feedback and the Origin and Fate of the Hot Gas in Early-type Galaxies

http://adsabs.harvard.edu/abs/2018ApJ...856..115P

 

附件下载
©2008-2013 中国科学院上海天文台 版权所有
地址:上海市南丹路80号 邮编:200030 邮件:shao@shao.ac.cn