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Aims. This study aims to explore the relationship between the physicalproperties of different galaxy subclasses and their environment based on theanalysis of 31 631 VIMOS Public Extragalactic Redshift Survey (VIPERS) galaxiesobserved at 0.5 < z < 0.9.  Methods. We use the results of an unsupervised clustering algorithm todistinguish 11 subclasses of VIPERS galaxies based on the multi-dimensionalfeature space defined by rest-frame UV to NIR colours presented in Siudek et al(2018a). We investigate the relationship between the properties of thesesubclasses of galaxies and their local environment, defined as the galaxydensity contrast derived from the 5th nearest neighbour technique.  Results. We confirm that the galaxy population-density relation is already inplace at z ~ 0.9, with the blue galaxy fraction decreasing with density,compensated by an increase of the red fraction. On average red galaxies in thehigh-density environment are larger by 28% than the ones in low-densityenvironments. In particular, we find one group of galaxies, subclass C3, whoseincrease of size with time can be explained mainly as the result of mergers;for other red subclasses, mergers would not seem to play a major role (subclassC2) or play a negligible role (subclass C1). The properties of the greengalaxies (subclasses C4-6) depend on whether their stellar mass is above orbelow a transition mass. Low-mass green galaxies appear to have grown throughsecular processes, while in high-mass green galaxies mass assembly appears tobe dominated by mergers. When it comes to blue galaxies, the trend ofdecreasing fraction with denser environments seen for the group as a whole(subclasses C7-11) is found to be driven mostly by one group of galaxies,subclass C10. These are compact low-mass galaxies with high sSFRs, that arepreferentially found in low-density environments.

Shaping physical properties of galaxy subtypes in the VIPERS survey: environment matters