2kpc environments of 472 supernovae

Using ultraviolet (UV; from Galaxy Evolution Explorer) and infrared (IR; from Wide-field Infrared Survey Explorer) maps of 359 galaxies and a sample of 472 SNe, we measure the star formation rate surface density ({Sigma}_SFR_) and stellar mass surface density ({Sigma}_*_) in a 2kpc beam centered on each SN site.

We show that core-collapse SNe are preferentially located along the resolved galactic star-forming main sequence, whereas Type Ia SNe are extended to lower values of {Sigma}_SFR_ at fixed {Sigma}_*_, indicative of locations inside quiescent galaxies or quiescent regions of galaxies. We also test how well the radial distribution of each SN type matches the radial distributions of UV and IR light in each host galaxy. We find that, to first order, the distributions of all types of SNe mirror those of both near-IR light (3.4 and 4.5{mu}m, tracing the stellar mass distribution) and mid-IR light (12 and 22{mu}m, tracing emission from hot, small grains), and also resemble our best-estimate {Sigma}_SFR_.