Detecting strongly lensed supernovae at z ~ 5-7 with LSST

Claes-Erik Rydberg, Daniel J. Whalen, Matteo Maturi, Thomas Collett, Mauricio Carrasco, Mattis Magg, Ralf S. Klessen

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Abstract

Supernovae (SNe) could be powerful probes of the properties of stars and galaxies at high redshifts in future surveys. Wide fields and longer exposure times are required to offset diminishing star formation rates and lower fluxes to detect useful numbers of events at high redshift. In principle, the Large Synoptic Survey Telescope (LSST) could discover large numbers of early SNe because of its wide fields but only at lower redshifts because of its AB mag 24 - 25 limits. But gravitational lensing by galaxy clusters and massive galaxies could boost flux from ancient SNe and allow LSST to detect them at earlier times. Here, we calculate detection rates for lensed SNe at z ~ 5 - 7 for LSST. We find that the LSST main survey could detect ~ 1 - 2 lensed Population III (Pop III) SN but 130-1400 Pop I/II SNe. An alternative deep survey with a one-year cadence could find ~10 Pop III SNe with an 84h exposure and ~50 SNe with a 420h exposure.
Original languageEnglish
Pages (from-to)2447-2459
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume491
Issue number2
Early online date22 Nov 2019
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • astro-ph.GA
  • astro-ph.CO
  • astro-ph.HE
  • RCUK
  • STFC
  • ST/P000509/1
  • gravitational lensing: strong
  • stars: Population III
  • supernovae: general
  • galaxies: high-redshift
  • cosmology: observations
  • cosmology: dark ages
  • reionization
  • first stars: early universe

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