27-31 August 2018
LVH, Luisenstraße 58, 10117 Berlin
Europe/Berlin timezone
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Contribution Talk

-3- Rudolf Virchow
Cosmology

Fingerprints of the First Stars in the Sky-Average Radio Spectrum

Speakers

  • Dr. Raul MONSALVE

Primary authors

Abstract content

I will present the measurement of an absorption feature in the sky-averaged radio spectrum centered at 78 MHz with the EDGES experiment. The measured feature is broadly consistent with the absorption of photons from the microwave background by neutral hydrogen gas in the intergalactic medium (IGM) due to significant star formation about 180 million years after the Big Bang. Despite this consistency, the amplitude, shape, and frequency of the feature are in tension with physical predictions for either the temperature of the IGM or the microwave background at those redshifts. In my talk I will describe the EDGES measurement, carried out from the desert of Western Australia, and some of the proposed physical implications, if the measurement is independently verified.