New Method Uses Correlation Drop to Pinpoint the Start of Cosmic Reionization
By
Laurie Amen
Summary
This article discusses a new astrophysical method to constrain the start of the Epoch of Reionization (EoR) — the period when the first stars and galaxies ionized the neutral hydrogen in the intergalactic medium. The researchers propose using a "correlation drop" signal in the 21-cm hydrogen line to detect when reionization began. By analyzing the cross-correlation between the 21-cm signal and cosmic microwave background (CMB) temperature fluctuations, they show that a sharp drop in correlation can serve as a boundary condition marking the onset of reionization. This technique offers a new observational probe for an era that remains poorly understood.
Source
bskyNew Method Uses Correlation Drop to Pinpoint the Start of Cosmic Reionizationastrobites.orgKey quotes
· 3 pulledToday, most of the matter between galaxies is made up of ionized gas, but this wasn't always the case.
We still don't know very much about the mysterious epoch of reionization.
In today's bite, learn about a new way to estimate when reionization started from a correlation drop!
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