  We study numerically the critical behavior of a modified, active
Asakura-Oosawa model for colloid-polymer mixtures. The colloids are modeled as
self-propelled particles with Vicsek-like interactions. This system undergoes
phase separation between a colloid-rich and a polymer-rich phase, whereby the
phase diagram depends on the strength of the Vicsek-like interactions.
Employing a subsystem-block-density distribution analysis, we determine the
critical point and make an attempt to estimate the critical exponents. In
contrast to the passive model, we find that the critical point is not located
on the rectilinear diameter. A first estimate of the critical exponents $\beta$
and $\nu$ is consistent with the underlying 3d-Ising universality class
observed for the passive model.
