Decomposing galaxy color bimodality at z ∼1 in VIPERS

The study of the VIPERS galaxy $UBV$ and $NUVrK$ colour distributions in narrow redshift and stellar mass bins display the bimodality very well approximated by the sum of two Gaussian functions. We show that galaxy number excess over the sum of two Gaussians in the green valley regionis statistically significant only when a wide redshift and/or stellar mass range is considered. We found that the crossing time across the green valley region is not longer than 1.5 Gyrs.