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SHAO Astrophysics Colloquia

Title: Not-so-simple stellar populations in nearby, resolved massive star clusters
Speaker: Richard de Grijs (KIAA/Peking)

Time: 1:30 PM, January 19 (Thursday)

Location: Lecture Hall, 3rd floor

Abstract:

Until about a decade ago, star clusters were considered "simple" stellar populations: all stars in a cluster were thought to have similar ages and the same metallicity. Only the individual stellar masses were thought to vary, in essence conforming to a "universal" initial mass function. Over the past decade, this situation has changed dramatically. I will discuss my group's recent progress in this context, with particular emphasis on the properties and the alleged presence of multiple populations in Local Group star clusters across the full age range.  Our most recent results imply a reverse paradigm shift, back to the old simple stellar population picture for at least some intermediate- age (~2 Gyr-old) star clusters, which opens up exciting avenues for future research efforts.

Title: "The Science of Heaven" documentary screening

Speaker: Richard de Grijs (KIAA, Beijing)

Time & Place: Monday, 3:00pm, January 16th, 3rd floor Lecture Hall, SHAO

Abstract: For thousands of years, Chinese astronomers have watched the sky by day and at night, looking for -- as the Yi Jing (the Book of Changes) puts it -- “symbols from above, which show good or bad fortune”. But in the last few decades China has been catching up. The government’s Five Year Plan states that China must push forward its exploration of planets, asteroids and the Sun. If this happens according to the country’s usual growth rate, much can be expected from “The Science of Heaven” over the next decades. In this documentary we explore the Chinese history of the “Science of Heaven”, and we establish links to the most recent Chinese explorations in astronomy and astrophysics. We visit observatories in remote areas in China, we witness the final construction phase of the world’s largest radio telescope in Guizhou and we might end up on the Moon with the Chinese Lunar Program. This documentary was originally conceived by Richard de Grijs (Kavli Institute for Astronomy and Astrophysics, Peking University) and Ziping Zhang (Beijing Planetarium). They commissioned René Seegers as director/producer and secured funding from the National Natural Science Foundation of China (NSFC). The documentary is targeted at a general audience.

Galaxy Seminar

Location: 1714

Time: 10:30, Jan.18 (Wednesday)

Title: Intermediate-Width Emission Lines in Active Galactic Nuclei

Speaker: Zhenzhen Li

Contact: Jian Fu, Fangting Yuan, Chunyan Jiang, Zhaoyu Li, Ting Xiao

Abstract: It is generally accepted that emission lines of active galactic nuclei arise from two well-separated regions: the broad emission line region (BELR) and the narrow emission line region (NELR). This separation of emission-line regions yields an obviousgap between these two regions. Some researchers suggested that AGNs also contain intermediate-width emission line regions (IELRs) producing intermediate-width emission lines (IELs). A consensus, however, is yet to be arrived at due to the lack of convincing evidence for their detection. Recently, we detected prominent IELs in a partially obscured quasar OI 287, where the conventional BELs are heavily suppressed by extinction. The clearly detected IELs provide strong evidence for the existence of the IELR, which has been in debate for two decades. Also, we found that the IELs in normal quasar are usually very weak, which cannot be detected if the BELR is not obscured. Finally, I will report the physical reason for explaining the observed suppression of the gap between the BELR and the NELR.

References :

http://adsabs.harvard.edu/abs/1993ApJ...415..563W 

http://adsabs.harvard.edu/abs/1993ApJ...404L..51N 

http://adsabs.harvard.edu/abs/2015ApJ...812...99L 

http://adsabs.harvard.edu/abs/2016ApJ...831...68A 

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 (Jan.18th)

Speaker: Bin Liu

Title: Spin-Orbit Misalignment of Merging Black Hole Binaries: Effects from External Perturber

Speaker: Xiaodong Duan

Title: AGN Heating in Simulated Cool-Core Clusters

http://adsabs.harvard.edu/abs/2016arXiv161105455L

Location: 1608

Time: 14:00-16:00, Wednesday (Jan. 18)

Galactic Dynamics Group Journal Club

Time & Location: 9:30 AM, January 19 (Thursday),Room 1608

Title: Intermediate-Width Emission Lines in Active Galactic Nuclei

Speaker: Zhenzhen Li

Abstract: It is generally accepted that emission lines of active galactic nuclei arise from two well-separated regions: the broad emission line region (BELR) and the narrow emission line region (NELR). This separation of emission-line regions yields an obviousgap between these two regions. Some researchers suggested that AGNs also contain intermediate-width emission line regions (IELRs) producing intermediate-width emission lines (IELs). A consensus, however, is yet to be arrived at due to the lack of convincing evidence for their detection. Recently, we detected prominent IELs in a partially obscured quasar OI 287, where the conventional BELs are heavily suppressed by extinction. The clearly detected IELs provide strong evidence for the existence of the IELR, which has been in debate for two decades. Also, we found that the IELs in normal quasar are usually very weak, which cannot be detected if the BELR is not obscured. Finally, I will report the physical reason for explaining the observed suppression of the gap between the BELR and the NELR.

References :

http://adsabs.harvard.edu/abs/1993ApJ...415..563W 

http://adsabs.harvard.edu/abs/1993ApJ...404L..51N 

http://adsabs.harvard.edu/abs/2015ApJ...812...99L 

http://adsabs.harvard.edu/abs/2016ApJ...831...68A 

 
中心简介
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    天体物理研究室是上海天文台从事基础天体物理研究的主要机构,包括12个科研团组。研究室的研究方向涉及黑洞和高能天体物理、星系形成与演化、宇宙大尺度 结构、星团和银河系结构、恒星形成、以及行星天体物理等领域,在黑洞吸积与喷流理论、黑洞和星系的共同演化、银河系结构与动力学、计算天体物理等方向具有一定的国际影响力。研究室现有固定研究人员固定研究人员45名,博士后16名,研究生65名。固定研究人员中包括国家杰出青年基金获得者3人、优秀青年基金获得者2人、科学院“百人计划”入选者9人。
    研究室与国内外的天文研究机构有着密切的合作关系,与中国科技大学联合成立了“中国科学院星系和宇宙学重点实验室”,与厦门大学成立了天体物理联合中心。研究室还参与了多项国际、国内天文项目和观测计划,如LAMOST、HXMT、SDSS-IV、TMT、LSST、FAST等。
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