Speaker
Description
Total-power radiometry with individual meter-wave antennas is a potentially effective way to study the Cosmic Dawn ($z\sim20$) through measurement of the sky brightness arising from the $21$~cm transition of neutral hydrogen, provided this can be disentangled from much stronger Galactic and extra-galactic foregrounds. In the process, measured spectra of integrated sky brightness temperature can be used to quantify the foreground emission properties.
In this talk, I present results from a subset of data from the Large-aperture Experiment to Detect the Dark Age (LEDA) in the $50-87$~MHz range. I will present the constraints on the foreground spectral index $\beta$ in the northern sky visible from mid-latitudes, focusing on two zenith-directed LEDA radiometers, and discuss how estimates of $\beta$ vary with local sidereal time (LST). Combining all data gathered during the extended campaign between mid-2018 to mid-2019, I will discuss the progress made in the quest for a cosmological signal.
| Reasearch area | Epoch of Reionization |
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