Chaplygin gas in light of recent integrated Sachs-Wolfe effect data

We investigate the possibility of constraining Chaplygin dark energy models with current integrated Sachs - Wolfe effect data. In the case of a flat universe we found that generalized Chaplygin gas models must have an energy density such that Omega(c) > 0.55 and an equation of state w < -0.6 at 95% c.l. We also investigate the recently proposed silent Chaplygin models, constraining Omega(c) > 0.55 and w < -0.65 at 95% c.l. Better measurements of the CMB - LSS correlation will be possible with the next generation of deep redshift surveys. This will provide independent and complementary constraints on unified dark energy models such as the Chaplygin gas.