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Astronomers used the lensed supernova Refsdal to measure the Universe's expansion rate. Time delays between supernova images yielded a precise Hubble constant value, aiding cosmological studies.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Gravitational Lensing

Background:

  • The Refsdal supernova provided a unique opportunity to study gravitational lensing.
  • Supernova Refsdal appeared in multiple images due to lensing by a galaxy cluster.

Purpose of the Study:

  • To perform a blinded measurement of the Hubble constant (H0).
  • To utilize time delays between lensed supernova images for cosmological parameter estimation.

Main Methods:

  • Employing gravitational lensing models of the galaxy cluster.
  • Analyzing the time delays between the multiple images of the Refsdal supernova.
  • Comparing results from eight different cluster lens models.

Main Results:

  • Inferred a value for the Hubble constant (H0) using eight cluster lens models.
  • Obtained a more precise H0 value using the two models most consistent with observations.
  • Found that models assigning dark-matter halos to individual galaxies and the cluster best reproduced the observations.

Conclusions:

  • Gravitationally lensed supernovae offer a novel method for measuring the Hubble constant.
  • The study refines cosmological measurements by leveraging the Refsdal event.
  • The distribution of dark matter within galaxy clusters impacts lensing effects and cosmological measurements.