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Our aim is to understand the role of the environment in the quenching of starformation of galaxies located in the infall cluster region of Abell 85 (A85).This is achieved by studying the post-starburst galaxy population as tracer ofrecent quenching. By measuring the equivalent width (EW) of the [OII] andHdelta spectral lines, we classify the galaxies in three groups: passive (PAS),emission line (EL), and post-starburst (PSB) galaxies. The PSB galaxypopulation represents about 4.5% of the full sample. Dwarf galaxies (Mr >-18.0) account for about 70 - 80% of PSBs, which indicates that most of thegalaxies undergoing recent quenching are low-mass objects. Independently of theenvironment, PSB galaxies are disk-like objects with g - r colour between theblue ELs and the red PAS ones. The PSB and EL galaxies in low-densityenvironments show similar luminosities and local galaxy densities. The dynamicsand local galaxy density of the PSB population in high density environments areshared with PAS galaxies. However, PSB galaxies inside A85 are at shorterclustercentric radius than PAS and EL ones. The value of the EW(Hdelta) islarger for those PSBs closer to the cluster centre. We propose two differentphysical mechanisms producing PSB galaxies depending on the environment. In lowdensity environments, gas-rich minor mergers or accretions could produce thePSB galaxies. For high density environments like A85, PSBs would be produced bythe removal of the gas reservoirs of EL galaxies by ram-pressure stripping whenthey pass near to the cluster centre.

Deep spectroscopy of nearby galaxy clusters: IV The quench of the star formation in galaxies in the infall region of Abell\ 85