The eras of Cosmic Dawn (when first-generation stars were formed) and reionization (when first-generation galaxies systematically ionized our Universe) are rather mysterious epochs in our cosmic timeline. New radio interferometers promise to change this by mapping out spatial fluctuations of neutral hydrogen at high redshifts via the 21cm line. In this talk, I will discuss recent upper limits on the high-redshift 21cm signal set by the Hydrogen Epoch of Reionization Array (HERA). I will explain the science implications of these limits, particularly how they are already putting constraints on the X-ray emission of first-galaxies. Additionally, I will discuss how these relate to other observations of the high-redshift universe, and highlight future science opportunities with HERA and similar instruments.
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2022-01-31T15:00:002022-01-31T16:00:00First Constraints on Reionization from HERAEvent Information:
The eras of Cosmic Dawn (when first-generation stars were formed) and reionization (when first-generation galaxies systematically ionized our Universe) are rather mysterious epochs in our cosmic timeline. New radio interferometers promise to change this by mapping out spatial fluctuations of neutral hydrogen at high redshifts via the 21cm line. In this talk, I will discuss recent upper limits on the high-redshift 21cm signal set by the Hydrogen Epoch of Reionization Array (HERA). I will explain the science implications of these limits, particularly how they are already putting constraints on the X-ray emission of first-galaxies. Additionally, I will discuss how these relate to other observations of the high-redshift universe, and highlight future science opportunities with HERA and similar instruments.Event Location:
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