High-redshift supernova rates measured with the gravitational telescope A1689

Abstract

We present a ground-based near-infrared search for lensed supernovae behind the massive cluster Abell 1689 at z=0.18, one of the most powerful gravitational telescopes that nature provides. Our survey was based on multi-epoch $J$-band observations with the HAWK-I instrument on VLT, with supporting optical data from the Nordic Optical Telescope. Our search resulted in the discovery of five high-redshift, $0.671<z<1.703$, photometrically classified core-collapse supernovae with magnifications in the range $\Delta m$ = $-0.31$ to $-1.58$ mag, as calculated from lensing models in the literature. Thanks to the power of the lensing cluster, the survey had the sensitivity to detect supernovae up to very high-redshifts, $z$$\sim$$3$, albeit for a limited region of space. We present a study of the core-collapse supernova rates for $0.4\le z<2.9$, and find good agreement with both previous estimates, and the predictions from the star formation history. During our survey, we also discovered 2 type Ia supernovae in A1689 cluster members, which allowed us to determine the cluster Ia rate to be $0.14_{-0.09}^{+0.19}\pm 0.01$ $\mathrm{SNuB}$$h^2$ (SNuB$\equiv 10^{-12}\mathrm{SNe}{\mathrm{L}}_{\odot ,\mathrm{B}}^{-1}\mathrm{y}{\mathrm{r}}^{-1}$). The cluster rate normalized by the stellar mass is $0.10_{-0.06}^{+0.13}\pm 0.02$ in $\mathrm{SNuM}$$h^2$ (SNuM$\equiv 10^{-12}\mathrm{SNe}{\mathrm{M}}_{\odot }^{-1}\mathrm{y}{\mathrm{r}}^{-1}$). Furthermore, we explore the optimal future survey for improving the core-collapse supernova rate measurements at $z\gtrsim 2$ using gravitational telescopes, as well as for the detections with multiply lensed images, and find that the planned WFIRST space mission has excellent prospects. Massive clusters can be used as gravitational telescopes to significantly expand the survey range of supernova searches, with important implications for the study of the high-$z$ transient universe.

22 pages, 13 figures

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