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Combined constraints on modified Chaplygin gas model from cosmological observed data: Markov Chain Monte Carlo approach

We use the Markov Chain Monte Carlo method to investigate a global constraints on the modified Chaplygin gas (MCG) model as the unification of dark matter and dark energy from the latest observational data: the Union2 dataset of type supernovae Ia (SNIa), the observational Hubble data (OHD), the cluster X-ray gas mass fraction, the baryon acoustic oscillation (BAO), and the cosmic microwave background (CMB) data. In a flat universe, the constraint results for MCG model are, $Ω_{b}h^{2}=0.02263^{+0.00184}_{-0.00162}$ ($1σ$) $^{+0.00213}_{-0.00195}$ $(2σ)$, $B_{s}=0.7788^{+0.0736}_{-0.0723}$ ($1σ$) $^{+0.0918}_{-0.0904}$ $(2σ)$, $α=0.1079^{+0.3397}_{-0.2539}$ ($1σ$) $^{+0.4678}_{-0.2911}$ $(2σ)$, $B=0.00189^{+0.00583}_{-0.00756}$ ($1σ$) $^{+0.00660}_{-0.00915}$ $(2σ)$, and $H_{0}=70.711^{+4.188}_{-3.142}$ ($1σ$) $^{+5.281}_{-4.149}$ $(2σ)$.