SHAO Astrophysics Colloquia
Title: Cosmic ray physics and dark matter searches with AMS-02
Time: 3 PM, June 15 (Thursday)
Speaker: Prof. Qiang Yuan (Purple Mountain Observatory)
Location: Lecture Hall, 3rd floor
Abstract: The Alpha Magnetic Spectrometer (AMS-02) on the International Space Station represents a new era of astroparticle physics with unprecedentedly high precision. After more than five years operation, AMS-02 has observed the electrons, positrons, protons, helium nuclei, and boron-to-carbon ratio of cosmic rays to TeV energies, which reveal many new phenomena in understanding the origin, propagation, and interaction of cosmic rays, as well as interesting implications and/or constraints on the properties of dark matter particles. An overview of cosmic ray physics will be given in the talk, with an emphasis of the relatively low energy range reachable by space detectors. The implications of the AMS-02 data on understanding the puzzles of cosmic rays and particle dark matter will be discussed.
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(Jun 14th)
Speaker: Xiaodong Duan
1. Hot Gaseous Atmospheres in Galaxy Groups and Clusters Are Both Heated and Cooled by X-Ray Cavities
http://adsabs.harvard.edu/abs/2015ApJ...802..118B
2. Formation of cold filaments in cooling flow clusters
http://adsabs.harvard.edu/abs/2008A%26A...477L..33R
Speaker: Maochun Wu
Title: Deep Chandra, HST-COS, and Megacam Observations of the Phoenix Cluster: Extreme Star Formation and AGN Feedback on Hundred Kiloparsec Scales
Galactic Dynamics Group Journal Club
Speaker: Zhenzhen Li
Location: Room 1608
Time: June 15th (Thursday) 9:45 AM
Title: How to understand the physical condition of ionized gas by using the observed spectral data and CLOUDY model ?
Abstract: Numerical simulation make it possible to understand complex physical environments starting from first principles. CLOUDY is designed to do just that. It determines the physical conditions within a non-equilibrium gas, possibly exposed to an external source of radiation, and predicts the resulting spectrum. This makes it possible to predict many observed quantities by specifying only the properties of the cloud and the radiation field striking it. In this talk, first I will brief the physical principles how CLOUDY work. Then, I will introduce the operation of CLOUDY, including how to set up the code, how to read the resulting spectrum, and how to derived the physical parameters of ionized gas by comparing the predicted spectrum with observed spectrum.