Microwave and radio emission of dusty star-forming galaxies: Implication for the cosmic radio background

Understand

We use the most up-to-date cosmological evolution models of star-forming (SF) galaxies and radio sources to compute the extragalactic number counts and the cosmic background from 408MHz to 12THz.

• The model of SF galaxies reproduces the constraints obtained by Spitzer, Herschel, and ground-based submm/mm experiments: number counts, redshift distribution of galaxies, cosmic background intensity and anisotropies.
• The template SEDs of this model are extrapolated to the radio adding synchrotron, free-free, and spinning dust emissions.
• To fix the synchrotron intensity, we use the IR/radio flux ratio, q70, and a spectral index beta=-3.