  Scalar-field dark energy models for tachyon fields are often regarded as an
effective description of an underlying theory of dark energy. In this paper, we
propose the agegraphic dark energy model in tachyon cosmology by interaction
between the components of the dark sectors. In the formalism, the interaction
term emerges from the tachyon field nonminimally coupled to the matter
Lagrangian in the model rather than being inserted into the formalism as an
external source. The model is constrained by the observational data. Based on
the best fitted parameters in both original and new agegraphic dark energy
scenarios, the model is tested by Sne Ia data. The tachyon potential and
tachyon field are reconstructed and coincidence problem is revisited.
