Three Gravitationally Lensed Supernovae behind CLASH Galaxy Clusters

摘要: We report observations of three gravitationally lensed supernovae (SNe) in the Cluster Lensing And Supernova survey with Hubble (CLASH) Multi-Cycle Treasury program. These objects, SN CLO12Car (z = 1.28), CLN12Did 0.85), and CLA11Tib 1.14), are located behind different clusters, MACSJ1720.2+3536 0.391), RXJ1532.9+3021 0.345), A383 0.187), respectively. Each was detected Space Telescope optical infrared images. Based on photometric classification, we find that SNe likely to be Type Ia (SNe Ia), while classification is inconclusive. Using multi-color light-curve fits determine a standardized luminosity distance, infer ~1.0 ± 0.2 mag brighter than field at similar redshift ascribe this gravitational lens magnification. Similarly, ~0.2 Ia. derive independent estimates predicted magnification from CLASH strong+weak-lensing maps clusters (in magnitude units, 2.5 log_(10)μ): 0.83 0.16 for CLO12Car, 0.28 0.08 CLN12Did, 0.43 0.11 CLA11Tib. The two provide new test cluster model predictions: magnifications based brightness those by consistent. Our results herald promise future samples cluster-lensed (from ground or space) help illuminate dark-matter distribution galaxies, through direct determination absolute magnifications.