Speaker
Description
I will discuss the most recent upper limit on the 21cm Power Spectrum from the HERA Collaboration, which used 94 nights of observing with Phase I of the instrument. I will show that these most recent limits are mostly consistent with thermal noise, and represent the deepest limits to date at redshifts 7.9 and 10.4 respectively. I will also touch on the state-of-the-art validation pipeline developed by our team, and focus on the astrophysical interpretation afforded by these measurements. In particular, we rule out a broader set of "cold reionization" scenarios than has been previously possible, with ramifications for the sources of early heating. Finally, I will briefly discuss progress on upcoming data releases from HERA, which push the observing window out to Cosmic Dawn (z>13).
