Abstract
In recent years, many -ray sources have been identified, yet the unresolved component hosts valuable information on the faintest emission. In order to extract it, a cross-correlation with gravitational tracers of matter in the Universe has been shown to be a promising tool. We report here the first identification of a cross-correlation signal between rays and the distribution of mass in the Universe probed by weak gravitational lensing. We use data from the Dark Energy Survey Y1 weak lensing data and the Fermi Large Area Telescope 9-yr -ray data, obtaining a signal-to-noise ratio of 5.3. The signal is mostly localized at small angular scales and high -ray energies, with a hint of correlation at extended separation. Blazar emission is likely the origin of the small-scale effect. We investigate implications of the large-scale component in terms of astrophysical sources and particle dark matter emission.
- Received 22 August 2019
- Revised 14 December 2019
- Accepted 13 January 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.101102
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Published by the American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
Potential Hint of Dark Matter in Universe Maps
Published 9 March 2020
A detected overlap of gravitational lenses and gamma-ray signals could shed light on the nature of dark matter.
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