  We propose a renormalizable model for vector dark matter with extra U(1)
gauge symmetry, which is broken by the VEV of a complex singlet scalar. When
the singlet scalar has a quartic coupling to a heavy charged scalar, the
resonance effect enhances the annihilation cross section of vector dark matter
into two photons such that Fermi-gamma ray line at about 130 GeV is obtained.
In the presence of a tiny mixing between the singlet scalar and the Standard
Model Higgs doublet, the relic density is determined dominantly by WW/ZZ and
two-photon channels near the resonance pole of the singlet scalar. We also show
that various phenomenological bounds coming from the Higgs to diphoton decay
rate, precision data and collider searches for the charged scalar and vacuum
stability are satisfied in the model.
