Abstract: Observations of the 21cm hydrogen line in the early universe (redshifts 25 to 5) are expected to shed light on the origins of stars, inflation, and dark matter. First generation interferometers have placed ever-lower limits on the fluctuation power spectrum and the EDGES experiment has reported a potential global absorption trough at redshift 18. The Hydrogen Epoch of Reionization Array (HERA) is a second generation instrument which aims for a high significance power spectrum measurement between redshifts 5.5 and 12 and experimental observations to redshift 18. In 2016 HERA was operated with 20% of its collecting area. This data has been used to develop a pipeline which has produced what is currently the lowest power spectrum upper limit. I will report on these results and describe our upgrade campaign for the full array aimed at lowering systematic floors and expanding the redshift range to 25.
The speaker will be available for one-on-one meetings on Monday April 5 - Weds April 7. If you would like to meet with the speaker, please contact Peter Timbie firstname.lastname@example.org to set up an appointment.