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Exploiting the slitless spectroscopy taken as part of the GrismLens-Amplified Survey from Space (GLASS), we present an extended analysis ofthe spatial distribution of star formation in 76 galaxies in 10 clusters at0.3< z <0.7. We use 85 foreground and background galaxies in the same redshiftrange as a field sample. The samples are well matched in stellar mass(10^8-10^11 M_sun) and star formation rate (0.5-50 M_sun/yr). We visuallyclassify galaxies in terms of broad-band morphology, Halpha morphology andlikely physical process acting on the galaxy. Most Halpha emitters have aspiral morphology (41+/-8% in clusters, 51+/-8% in the field), followed bymergers/interactions (28+/-8%, 31+/-7%, respectively) and early-type galaxies(remarkably as high as 29+/-8% in clusters and 15+/-6% in the field). Adiversity of Halpha morphologies is detected, suggesting a diversity ofphysical processes. In clusters, 30+/-8% of the galaxies present a regularmorphology, mostly consistent with star formation diffused uniformly across thestellar population (mostly in the disk component, when present). The secondmost common morphology (28+/-8%) is asymmetric/jellyfish, consistent with rampressure stripping or other non-gravitational processes in 18+/-8% of thecases. Ram pressure stripping appears significantly less prominent in the field(2+/-2%), where the most common morphology/mechanism appears to be consistentwith minor gas rich mergers or clump accretion. This work demonstrates thatwhile environment specific mechanisms affect galaxy evolution at this redshift,they are diverse and their effects subtle. A full understanding of thiscomplexity requires larger samples and detailed and spatially resolved physicalmodels.

astrophysical journal/the astrophysical journal

The Grism lens-amplified survey from space (GLASS). VII. The diversity  of the distribution of star formation in cluster and field galaxies at  0.3<z<0.7