Detection of cross-correlation between gravitational lensing and gamma rays
Abstract
In recent years, many gamma-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 gamma 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 Fermi Large Area Telescope 9-year gamma-ray data, obtaining a signal-to-noise ratio of 5.3. The signal is mostly localised at small angular scales and high gamma-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.
Cite
@article{arxiv.1907.13484,
title = {Detection of cross-correlation between gravitational lensing and gamma rays},
author = {S. Ammazzalorso and D. Gruen and M. Regis and S. Camera and S. Ando and N. Fornengo and K. Bechtol and S. L. Bridle and A. Choi and T. F. Eifler and M. Gatti and N. MacCrann and Y. Omori and S. Samuroff and E. Sheldon and M. A. Troxel and J. Zuntz and M. Carrasco Kind and J. Annis and S. Avila and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and J. Carretero and F. J. Castander and M. Costanzi and L. N. da Costa and J. De Vicente and S. Desai and H. T. Diehl and J. P. Dietrich and P. Doel and S. Everett and B. Flaugher and P. Fosalba and J. Garcia-Bellido and E. Gaztanaga and D. W. Gerdes and T. Giannantonio and D. A. Goldstein and R. A. Gruendl and G. Gutierrez and D. L. Hollowood and K. Honscheid and D. J. James and M. Jarvis and T. Jeltema and S. Kent and N. Kuropatkin and O. Lahav and T. S. Li and M. Lima and M. A. G. Maia and J. L. Marshall and P. Melchior and F. Menanteau and R. Miquel and R. L. C. Ogando and A. Palmese and A. A. Plazas and A. K. Romer and A. Roodman and E. S. Rykoff and C. Sanchez and E. Sanchez and V. Scarpine and S. Serrano and I. Sevilla-Noarbe and M. Smith and M. Soares-Santos and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and V. Vikram and Y. Zhang},
journal= {arXiv preprint arXiv:1907.13484},
year = {2020}
}
Comments
24 pages, 10 figures, v2: text re-arranged, typos corrected, slight improvement in the detection significance, matching version accepted for publication in PRL