TYPE IA SUPERNOVA RATE MEASUREMENTS TO REDSHIFT 2.5 FROM CANDELS: SEARCHING FOR PROMPT EXPLOSIONS IN THE EARLY UNIVERSE

arXiv

When the rate measurements from HST surveys are examined in isolation, the rarity of SN Ia detections at z > 1:5 hints that prompt progenitors in the early universe may in fact be relatively rare, accounting for as little as 5% of all SN Ia explosions - though further analysis and larger samples will be needed to examine that suggestion.