  We present a relativistic model describing a thin disk surrounded by a halo
in presence of an electromagnetic field. The model is obtained by solving the
Einstein-Maxwell equations on a particular conformastatic spacetime background
and by using the distributional approach for the energy-momentum tensor. A
class of solutions is obtained in which the gravitational and electromagnetic
potentials are completely determined by a harmonic function only. A particular
solution is given that is asymptotically flat and singularity-free, and
satisfies all the energy conditions.
