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The Chaplygin gas (CG) and the generalized Chaplygin gas (GCG) models,proposed as candidates of the unified dark matter-dark energy (UDME), aretested with the look-back time (LT) redshift data. We find that the LT dataonly give a very weak constraint on the model parameter. However, by combingthe LT with the baryonic acoustic oscillation peak, we obtain, at the 95.4%confidence level, $0.68\leq A_c\leq0.82$ and $0.59\leq h\leq0.65$ for the CGmodel, and $0.67\leq A_s\leq0.89$ and $-0.29\leq \alpha\leq0.61$ for the GCGmodel. This shows that both the CG and the GCG are viable as a candidate ofUDME. Within the GCG model, we also find that the Chaplygin gas model($\alpha=1$) is ruled out by these data at the 99.7% confidence level.

Testing the (generalized) Chaplygin gas model with the Lookback time-Redshift data