We use the latest data to investigate observational constraints on the new generalized Chaplygin gas ( NGCG ) model .
Using the Markov Chain Monte Carlo ( MCMC ) method , we constrain the NGCG model with the type Ia supernovae ( SNe Ia ) from Union2 set ( 557 data ) , the usual baryonic acoustic oscillation ( BAO ) observation from the spectroscopic Sloan Digital Sky Survey ( SDSS ) data release 7 ( DR7 ) galaxy sample , the cosmic microwave background ( CMB ) observation from the 7-year Wilkinson Microwave Anisotropy Probe ( WMAP7 ) results , the newly revised H ( z ) data , as well as a value of \theta _ { BAO } ( z = 0.55 ) = ( 3.90 \pm 0.38 ) ^ { \circ } for the angular BAO scale .
The constraint results for NGCG model are \omega _ { X } = -1.0510 _ { -0.1685 } ^ { +0.1563 } ( 1 \sigma ) _ { -0.2398 } ^ { +0.2226 } ( 2 \sigma ) , \eta = 1.0117 _ { -0.0502 } ^ { +0.0469 } ( 1 \sigma ) _ { -0.0716 } ^ { +0.0693 } ( 2 \sigma ) , and \Omega _ { X } = 0.7297 _ { -0.0276 } ^ { +0.0229 } ( 1 \sigma ) _ { -0.0402 } ^ { +0.0329 } ( 2 \sigma ) , which give a rather stringent constraint .
From the results , we can see a phantom model is slightly favored and the probability that energy transfers from dark matter to dark energy is a little larger than the inverse .