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Speaker: Josh Dillon (UC Berkeley) – Title: Recent Progress in 21 cm Cosmology with the Hydrogen Epoch of Reionization Array
May 8 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: May 8, 2025
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Josh Dillon (UC Berkeley)
Title: Recent Progress in 21 cm Cosmology with the Hydrogen Epoch of Reionization Array
Abstract: 21 cm cosmology promises a revolutionary new probe of the astrophysics and cosmology of the Cosmic Dawn and the epoch of reionization (EoR). I will discuss our progress with the Hydrogen Epoch of Reionization Array (HERA), an interferometer in South Africa with 350 14-m dishes, purpose-built for 21 cm cosmology. With early HERA data and only a small fraction of its final size and bandwidth, we have set world-leading limits on the 21 cm power spectrum. These results already have important astrophysical implications: they largely rule out “cold reionization” scenarios, provide a lower bound on the X-ray heating of the intergalactic medium, and constrain models of its origin. We are now preparing our first limits from HERA’s new broadband system (5 < z < 25), which should lay the groundwork for future results that realize the instrument’s full potential. In this talk, I will present these limits, their interpretation, and their statistical validation. Finally, I will look forward to the exciting science we can expect in the next few years from HERA, as well as the lessons it holds for future arrays for 21 cm cosmology.
https://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09
Meeting ID: 988 5432 2464
Passcode: 142239