Title: Lya Transmission in the Reionizing Intergalactic Medium

Speaker: Hyunbae Park (IPMU, Japan)

Date: 2021/7/1 Thursday, 11:00 - 12:30

Location: Online

Zoom: https://yonsei.zoom.us/j/85991173540

Abstract

We expect neutral hydrogen gas in intergalactic space to have scattered a significant portion of Lyα emission from star-forming galaxies during the reionization era. Thus, Lyα line strength of high-z galaxies is considered to be a promising probe of reionization history. In order to quantitatively understand which properties of the intergalactic medium (IGM) determine the transmission of the Lyα photons, we calculate the IGM transmissivity from the Cosmic Dawn II (CoDa II) simulation data and analyze the results. We find that the gravitational infall motion of the medium around galaxy, size of the HII region, and self-shielded neutral gas systems are the crucial factors of the transmissivity. In this talk, I will elaborate on how those factors affect the observability of high redshift Lyα emitters.