High-redshift radio galaxies: a potential new source of 21-cm fluctuations
High-redshift radio galaxies: a potential new source of 21-cm fluctuations
ABSTRACT Radio sources are expected to have formed at high redshifts, producing an excess radiation background above the cosmic microwave background (CMB) at low frequencies. Their effect on the redshifted 21-cm signal of neutral hydrogen is usually neglected, as it is assumed that the associated background is small. Recently, an …