CHIME’s Cosmic Echo: The First Detection of the 21 cm Auto-Power Spectrum.
Published: November 27, 2025
Duration: 15:32
Reference Article: Detection of the Cosmological 21 cm Signal in Auto-correlation at z ∼ 1 with the Canadian Hydrogen Intensity Mapping Experiment, by The CHIME Collaboration.
Summary:
We delve into a groundbreaking astronomical achievement: the **first detection of the cosmological 21 cm intensity mapping signal in auto-correlation at $z \sim 1$** using the Canadian Hydrogen Intensity Mapping Experiment (CHIME). This discovery utilizes 94 nights of observation data, covering a frequency range from 608.2 MHz to 707.8 MHz, corresponding to a mean redshift of approximately $z \sim 1.16$.
The detection was highly significant, measured at **$12.5\sigma$**. This ma...