Signature of excess radio background in the 21-cm global signal and power spectrum
Signature of excess radio background in the 21-cm global signal and power spectrum
The recent tentative detection by the EDGES Low-Band antenna of the hydrogen 21-cm line from cosmic dawn, if confirmed, is the first ever signature observed from the epoch of primordial star formation. However, the magnitude and the shape of this signal are incompatible with standard astrophysical predictions, requiring either colder …