Recovering 21cm Monopole Signals Without Smoothness
We expect the monopole signal at the lowest frequencies below $100,$MHz to be composed to two components: the deep Rayleigh-Jeans tail of the cosmic microwave background and two distinct features: the dark ages trough at $sim 17,$MHz and the cosmic dawn trough at $sim 75,$Mhz.These are hidden under orders of magnitude brighter foregrounds whose emi