  The computation of the emitted radiation by an accelerated external particle
can be addressed in a gauge theory with the insertion of a Wilson loop. With
the addition of conformal symmetry this problem is consistently formalized in
terms of correlation functions in presence of the Wilson loop, which are
constrained by defect CFT techniques. In theories with extended supersymmetry
we can also resort to supersymmetric localization on a four-sphere. By using
this set of tools, we review the close relation between the Bremsstrahlung
function and the stress energy tensor one-point coefficient in abelian theories
and in superconformal field theories. After presenting the state of the art for
generic CFTs, we mainly focus on the supersymmetric cases. We discuss the
differences between the maximally supersymmetric $\mathcal{N}=4$ case and
$\mathcal{N}=2$ SCFTs, and finally we review the general and exact result for
the emitted radiation in terms of a first order derivative of the Wilson loop
expectation value on a squashed sphere.
