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We present Wide Field Camera 3 images taken with the Hubble Space Telescopewithin a single field in the southern grand design star-forming galaxy M83.Based on their size, morphology and photometry in continuum-subtractedH$\alpha$, [\SII], H$\beta$, [\OIII] and [\OII] filters, we have identified 60supernova remnant candidates, as well as a handful of young ejecta-dominatedcandidates. A catalog of these remnants, their sizes and, where possible theirH$\alpha$ fluxes are given. Radiative ages and pre-shock densities are derivedfrom those SNR which have good photometry. The ages lie in the range $2.62 <log(\tau_{\rm rad}/{\rm yr}) < 5.0$, and the pre-shock densities at the blastwave range over $0.56 < n_0/{\rm cm^{-3}} < 1680$. Two populations of SNR havebeen discovered. These divide into a nuclear and spiral arm group and aninter-arm population. We infer an arm to inter-arm density contrast of 4. Thesurface flux in diffuse X-rays is correlated with the inferred pre-shockdensity, indicating that the warm interstellar medium is pressurised by the hotX-ray plasma. We also find that the interstellar medium in the nuclear regionof M83 is characterized by a very high porosity and pressure and infer a SNRrate of one per 70-150 yr for the nuclear ($R<300 $pc) region. On the basis ofthe number of SNR detected and their radiative ages, we infer that the lowermass of Type II SNe in M83 is $M_{\rm min} = 16^{+7}_ {-5}$ M$_{\odot}$.Finally we give evidence for the likely detection of the remnant of thehistorical supernova, SN1968L.

Supernova Remnants and the Interstellar Medium of M83: Imaging & Photometry with WFC3 on HST