SHAO Astrophysics Colloquia

Title: Properties of Spectroscopically-Confirmed Galaxies at z >= 6

Speaker: Linhua Jiang (KIAA/PKU)

Time: 3 PM, June 8 (Thursday)

Location: Lecture Hall, 3rd floor

Abstract:

Star-forming galaxies at redshift z >= 6 are natural tools to study the early galaxy formation and explore the history of cosmic reionization. In this talk, I will present our recent work on our understanding of these high-redshift galaxies. The talk will consist of two parts.In the first part, I will present the physical properties of a sample of spectroscopically confirmed galaxies at z>=6, including nearly 70 Lyman-alpha emitters (LAEs) and Lyman-break galaxies (LBGs). They have deep multi-band data and secure redshifts that allow us to reliably measure their physical properties.In the second part of the talk, I will introduce our on-going program that uses Magellan M2FS to spectroscopically identify a large number galaxy candidates at 5.6 < z < 7. M2FS is one of the most efficient instruments to identify relatively bright high-redshift galaxies. When the program completes, we will build the largest (in terms of areal coverage) sample of luminous,

spectroscopically-confirmed galaxies in this redshift range.This galaxy sample will be used to study physical properties of high-redshift galaxies and their implications to cosmic reionization.

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 7th)

Speaker: Weixiao Wang

Title: Numerical Simulations of Mass Outflows Driven from Accretion Disks by Radiation and Magnetic Forces

http://adsabs.harvard.edu/abs/2003ApJ...585..406P 

Speaker: Fuguo Xie

Title: Magnetically arrested disks and the origin of Poynting Jets: a numerical study

Galactic Dynamics Group Journal Club

Speaker: Zhenzhen Li

Location: Room 1608

Time: June 8th (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.