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Area of Science:

  • Astrophysics
  • Cosmology

Background:

  • Many gamma-ray sources are known, but faint emissions remain unstudied.
  • Cross-correlation with gravitational tracers is a promising method to probe faint signals.

Purpose of the Study:

  • To identify the cross-correlation signal between gamma rays and the Universe's mass distribution.
  • To investigate the origin and implications of this signal.

Main Methods:

  • Utilized data from the Dark Energy Survey Y1 weak lensing survey.
  • Analyzed 9-year gamma-ray data from the Fermi Large Area Telescope.
  • Performed cross-correlation analysis between gamma-ray and mass distribution data.

Main Results:

  • First identification of a cross-correlation signal between gamma rays and mass distribution, with a signal-to-noise ratio of 5.3.
  • Signal predominantly observed at small angular scales and high gamma-ray energies.
  • Hint of correlation detected at extended separations.

Conclusions:

  • The small-scale signal is likely from blazar emissions.
  • The large-scale component warrants further investigation for astrophysical sources and particle dark matter.
  • This method opens new avenues for studying the Universe's faint emission components.