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Wide-Field Lensing Mass Maps from Dark Energy Survey Science Verification Data.

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Scientists created a cosmic mass map using Dark Energy Survey data. This map reveals the distribution of luminous and dark matter, aiding cosmological studies and identifying galaxy clusters.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Gravitational Lensing

Background:

  • Cosmic structure formation is influenced by both luminous and dark matter.
  • Weak gravitational lensing provides a method to map the distribution of mass in the universe.

Purpose of the Study:

  • To construct a mass map using weak gravitational lensing shear measurements.
  • To utilize the mass map as a tool for cosmological studies.
  • To validate the mass map against known structures and simulations.

Main Methods:

  • Reconstruction of a mass map from weak gravitational lensing shear measurements over 139 deg2.
  • Utilizing data from the Dark Energy Survey science verification.
  • Cross-correlation analysis with a magnitude-limited foreground galaxy sample.

Main Results:

  • The mass map successfully probes both luminous and dark matter.
  • Good agreement was found between the mass map and identified massive galaxy clusters.
  • A significant 6.8σ detection in the cross-correlation measurement was achieved.
  • Measurements are consistent with N-body simulations of a Lambda Cold Dark Matter (ΛCDM) model.

Conclusions:

  • The reconstructed mass map is a valuable tool for cosmological investigations.
  • The consistency with simulations suggests low systematic uncertainties in the map.
  • The map aids in identifying large-scale structures like superclusters and voids.