  In this work we combine SEDs, radio maps and polarization observations to
understand the emission mechanisms in Cygnus X-1. Our radiative model indicates
that the MeV emission originates in the jet and that all the very high-energy
emission is from hadronic origin. We also performed a synthetic radio map that
suggests that our description of the magnetic field should be improved, since
it leads to a very compact emission region. In order to choose the most
suitable magnetic field geometry, we investigated the polarization in X-rays
and we found that very simple geometries can explain the high levels of
polarization reported by other authors.
