1803.05076
Galaxy and mass assembly (GAMA): impact of the group environment on galaxy star formation
Barsanti, et al
Explore how the group environment may affect the evolution of star-forming galaxies. Select 1197 GAMA groups at 0.05<=z<=0.2 and analyze the projected phase space (PPS) diagram, i.e. the galaxy velocity as a function of projected group-centric radius, as a local environmental metric in the low-mass halo regime 1e12 <=(M200/Msun) < 1e14. Study the properties of star-forming group galaxies, exploring the correlation of SFR with radial distance and stellar mass. Find that the fraction of star-forming group members is higher in the PPS regions dominated by recently accreted galaxies, whereas passive galaxies dominate the virtualized regions. Observe a small decline in specific SFR of star-forming galaxies towards the group center by a factor ~1.2 with respect to field galaxies. Similar to cluster studies, conclude for low-mass halos that star-forming group galaxies represent an infalling population from the field to the halo and show suppressed star formation.
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