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Astronomy Seminar Series artwork
February 6, 202311:30 am (CDT)

Using Lyα to Trace the Cosmic Reionization


Weida Hu (University of California, Santa Barbara)



Mitchell Institute for Fundamental Physics & Astronomy

College Station, Texas 77843

Event Details

The cosmic reionization is a milestone in the history of universe. The major questions of cosmic reionization are the evolution of neutral hydrogen fraction in the intergalactic medium, and the sources triggering the reionization event. The Lyα photons produced by young star-forming galaxies can be resonantly scattered by the neutral intergalactic medium, making them a powerful probe to cosmic reionization. In this talk, I will introduce an ongoing narrowband survey, Lyman Alpha Galaxies in the Epoch of Reionization (LAGER), aiming to search for Lyα emitting galaxies at redshift 7. We use the narrowband-selected LAEs to study the neutral hydrogen fraction and identify the large-scale structures at redshift 7. I will also present a recent work on using the Lyα line profile of local dwarf galaxies to investigate their ISM structures and properties.

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