Constraining dark energy models using Hubble parameter, Supernova, and BAO Data

We use Hubble parameter versus redshift data, Baryon Acoustic Oscillation (BAO) data and Supernova Type Ia (SNeIa) data to place constraints on model parameters of one constant two one time-evolving dark energy cosmological models. These constraints are we got are pretty much consistent with (through not as restrictive as) those derived by Yun {\&} Ratra (2011). The reason for that is the systematic errors in new BAO and SNeIa data are more as compared to the old data Yun {\&} Ratra (2011). A joint analysis of the Hubble parameter data with more restrictive baryon acoustic oscillation peak length scale and supernova Type Ia apparent magnitude data favors a spatially-flat cosmological model currently dominated by a time-independent cosmological constant but does not exclude slow time-varying dark energy.