Speaker
Description
Detecting and characterising the neutral hydrogen 21cm signal from the first billion years of the Universe remains a primary goal of most low-frequency radio telescopes. The structure and evolution of this signal encodes key information about the formation of structure in the early Universe, in the period termed the Epoch of Reionisation. In this talk, I will describe recent results from the MWA experiment. We compute the spherically-averaged power spectrum from four seasons of data obtained for the Epoch of Reionisation project observed with the MWA. We measure the EoR power spectrum over a range of scales at redshifts z=6.5-8.7. The largest aggregation of 110 hours on the EoR0 field in the high-band yields a lowest measurement of (43~mK)^2 at k=0.14 hMpc^{-1} and z=6.5 (2 sigma thermal noise plus sample variance). Using the Real-Time System to calibrate and the CHIPS pipeline to estimate power spectra, we select the best observations from the 2013-2016 observing seasons, observing three independent fields and in two frequency bands. We choose the cleanest 8,935 observations (298 hours of data) to form integrated power spectra over the different fields, pointings and redshift ranges.
| Suggested presentation duration (minutes) | 15 |
|---|
