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Detection of cross-correlation between gravitational lensing and gamma rays
Physical Review Letters ( IF 8.385 ) Pub Date : 
S. Ammazzalorso et al.

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 the Dark Energy Survey Y1 weak lensing catalogue and the {} Large Area Telescope 9-year -ray data, obtaining a signal-to-noise ratio of . The signal is mostly localised 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.
更新日期:2020-01-14

 

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