Solar abundance ratios of the iron-peak elements in the Perseus cluster

High-resolution X-ray spectra show near-solar abundances of chromium, manganese and nickel with respect to iron in the Perseus cluster, suggesting that the progenitors of type Ia supernovae could be near- and sub-Chandrasekhar-mass white dwarfs. Clusters of galaxies are embedded in hot gas, the elemental abundances of which arise from the cumulative effects of all of the supernovae that have occurred in the galaxies over the life of the cluster....