2020-12-10 10:00 Abstract
Title: Measure Dark Energy by Observing 30 Million Galaxies with 5000 Eyes
Speaker: Dr. Chia-Hsun Chuang (KIPAC)
Date: December 10 at 10:00
Location: R521, General Building II
Abstract:
Dark Energy Spectroscopic Instrument (DESI), a telescope in Arizona, USA, is equipped with 5000 robotic-optical-fibers to capture the lights from 5000 galaxies during each exposure. It will observe 35 million galaxies during the coming 5 years. It will be the largest data set of galaxy redshifts -- 10 times more than the data ever observed. We will make a 3D map of these galaxies and sketch the structure of our universe. We will be able to learn many things about our universe including its expansion history. We will also have a better understanding of dark matter and dark energy, which are still the most mysterious problems in cosmology. In this talk, I will also explain the methods extracting cosmological information from this 3D map.