Constraining the redshifted 21-cm signal with the unresolved soft X-ray background
Constraining the redshifted 21-cm signal with the unresolved soft X-ray background
We use the observed unresolved cosmic X-ray background (CXRB) in the 0.5–2 keV band and existing upper limits on the 21-cm power spectrum to constrain the high-redshift population of X-ray sources, focusing on their effect on the thermal history of the Universe and the cosmic 21-cm signal. Because the properties …