SHAO Astrophysics Colloquia

Title: Some Unsolved Problems in Black Hole - Galaxy Coevolution
Speaker: Luis C. Ho (何子山，KIAA/PKU)

Time: 3 PM, January 12 (Thursday)  

Location: Lecture Hall, 3rd floor  

Abstract:

The growth of supermassive black holes is thought to be strongly connected to the evolution of galaxies.  Despite the importance of this key topic in contemporary astrophysics, there are a number of outstanding, unsolved problems.  I will describe current challenges in black hole mass measurements, both in active and inactive galaxies, highlighting issues related to reverberation mapping, ionized gas dynamics, and stellar dynamics.  I will offer some thoughts on ways to make progress in future efforts toward black hole mass measurements.  I will also describe a major new program (BHOLE: Black hole - Host Lifecycle Evolution), which is aimed at a comprehensive investigation of the coevolution of hlack holes and galaxies across cosmic time, focusing on efforts to derive black hole mass accretion rates, galaxy star formation rates, and host galaxy stellar and gas masses.

Special Colloquium

Title: Red but not Dead: Starbursting Brightest Cluster Galaxies

Speaker: Prof. Haojing Yan (Univ. of Missouri - Columbia)

Time: 3 PM, January 13 (Friday)  

Location: Middle Conference Room, 3rd floor  

Galaxy Seminar

Location: 1714

Time: 10:30, Jan.11 (Wednesday)

Title: Did a Low-Mass Supernova Trigger the Formation of the Solar System? Clues from Stable Isotopes and 10Be

Speaker: Projjwal Banerjee (Shanghai Jiaotong University)

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

Abstract:

 About 4.6 billion years ago, some event disturbed a cloud of gas and dust, triggering the gravitational collapse that led to the formation of the solar system. A core-collapse supernova, whose shock wave is capable of compressing such a cloud, is an obvious candidate for the initiating event. This hypothesis can be tested because supernovae also produce telltale patterns of short-lived radionuclides, which would be preserved today as isotopic anomalies. Previous studies of the forensic evidence have been inconclusive, finding a pattern of isotopes differing from that produced in conventional supernova models. Here we argue that these difficulties either do not arise or are mitigated if the initiating supernova was a special type, low in mass and explosion energy. Key to our conclusion is the demonstration that short-lived 10Be can be readily synthesized in such supernovae by neutrino interactions, while anomalies in stable isotopes are suppressed.

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.11th)

Speaker: Fuguo Xie

Title: Interplay Among Cooling, AGN Feedback, and Anisotropic Conduction in the Cool Cores of Galaxy Clusters

http://adsabs.harvard.edu/abs/2016ApJ...818..181Y

Speaker: Peiyao Xu

Title: A Molecular Disk around the Episodic Jets in KjPn 8

http://adsabs.harvard.edu/abs/1997ApJ...483L..57H