CAVITY spatially resol. SFR of galaxies in voids

We measure their continuum-subtracted emission lines to obtain the maps of the SFR, specific star formation rate (sSFR) and extinction (A_V). From them, we assess the behaviour of the whole galaxies through their global properties, and the spatially-resolved information with radial profiles up to 2 half-light radii. We then compare the results with a sample of galaxies in filaments and walls from the CALIFA survey analysed using the same methodology.

We build a control sample matched in morphological type and total stellar mass by taking pairs of each CAVITY galaxy. We find no statistically significant differences in the SFR and sSFR (p<=0.05), although void galaxies tend to have larger SFR, especially for the early spirals.This effect is present for Sa galaxies at all galactocentric distances ({DELTA}logsSFR[Gyr^-1^]=0.25dex at 1 half light radius, HLR), and can also be seen in the outer parts (R>1HLR) of late-type spirals ({DELTA}logsSFR[Gyr^-1^]=0.26dex at 2 HLR), evidencing a slower transition from star-forming to quiescent and less evolved spiral discs.

Additionally, we find void late-type galaxies to have lower extinction ({DELTA}=0.16+/-0.06mag). Using the extinction normalised by the stellar mass surface density as a proxy for the gas mass fraction, we find it to be larger for the void early spirals (by a 5%), especially in their outer regions (23% larger). This indicates the effect of the void environment on the transition stage from star forming to passive.