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We use the Zurich ENvironmental Study (ZENS) database to investigate theenvironmental dependence of the merger fraction $\Gamma$ and merging galaxyproperties in a sample of ~1300 group galaxies with $M>10^{9.2}M_\odot$ and0.05<z<0.0585. In all galaxy mass bins investigated in our study, we find that$\Gamma$ decreases by a factor of ~2-3 in groups with halo masses$M_{HALO}>10^{13.5} M_\odot$ relative to less massive systems, indicating asuppression of merger activity in large potential wells. In the fiducial caseof relaxed groups only, we measure a variation $\Delta\Gamma/\Delta \log(M_{HALO}) \sim - 0.07$ dex$^{-1}$, which is almost independent of galaxy massand merger stage. At galaxy masses $>10^{10.2} M_\odot$, most mergers are dryaccretions of quenched satellites onto quenched centrals, leading to a strongincrease of $\Gamma$ with decreasing group-centric distance at these massscales.Both satellite and central galaxies in these high mass mergers do notdiffer in color and structural properties from a control sample of nonmerginggalaxies of equal mass and rank. At galaxy masses $<10^{10.2} M_\odot$, wherewe mostly probe satellite-satellite pairs and mergers between star-formingsystems, close pairs (projected distance $<10-20$ kpc) show instead$\sim2\times$ enhanced (specific) star formation rates and $\sim1.5\times$larger sizes than similar mass, nonmerging satellites. The increase in bothsize and SFR leads to similar surface star-formation densities in the mergingand control-sample satellite populations.

astrophysical journal/the astrophysical journal

The Zurich Environmental Study (ZENS) of Galaxies in Groups along the  Cosmic Web. V. Properties and Frequency of Merging Satellites and Centrals in  Different Environments