Supernovae in deep Hubble Space Telescope galaxy cluster fields: cluster rates and field counts

摘要: We have searched for high-redshift supernova (SN) candidates in multiple deep Hubble Space Telescope (HST) archival images of nine galaxy cluster fields. detect six apparent SNe, with 21.6I81428.4 mag. There is roughly 1 SN per (I814>26 mag), doubly-imaged WFPC2 field. Two SNe are associated galaxies (at redshifts z=0.18 and z=0.83), three probably not the clusters z=0.49, z=0.60, z=0.98), one at unknown z. After accounting observational efficiencies uncertainties (statistical systematic) we derive rate type Ia within projected central rich clusters: SNu 0.18z0.37 clusters, 0.83z1.27 (95 cent confidence interval; SNu≡1 century−1 1010 LB⊙). Combining two redshift bins, mean SNu. The upper bounds argue against being dominant source large iron mass observed intracluster medium. also compare our counts field (i.e. non-cluster all types) to recent model predictions. count N1 I81426 mag, 1N3 I81427 mag. These half some Since these magnitudes likely dominated by II observations may suggest obscuration distant II, or a luminosity distribution devoid high-luminosity tail.