Detection of Cross-Correlation between Gravitational Lensing and γ Rays

Journal Article · Mon Mar 09 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.124.101102· OSTI ID:1603810

Ammazzalorso, S. ; Gruen, D.; Regis, M.; Camera, S.; Ando, S.; Fornengo, N.; Bechtol, K.; Bridle, S.  L.; Choi, A.; Eifler, T.  F.; Gatti, M.; MacCrann, N.; Omori, Y.; Samuroff, S.; Sheldon, E.; Troxel, M.  A.; Zuntz, J.; Carrasco Kind, M.; Annis, J.; Avila, S. ; Bertin, E.; Brooks, D.; Burke, D.  L.; Carnero Rosell, A.; Carretero, J.; Castander, F.  J.; Costanzi, M.; da Costa, L.  N.; De Vicente, J.; Desai, S.; Diehl, H.  T.; Dietrich, J.  P.; Doel, P.; Everett, S.; Flaugher, B.; Fosalba, P.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D.  W.; Giannantonio, T.; Goldstein, D.  A.; Gruendl, R.  A.; Gutierrez, G.; Hollowood, D.  L.; Honscheid, K.; James, D.  J.; Jarvis, M.; Jeltema, T.; Kent, S.; Kuropatkin, N.; Lahav, O.; Li, T.  S.; Lima, M.; Maia, M.  A. G.; Marshall, J.  L.; Melchior, P.; Menanteau, F.; Miquel, R.; Ogando, R.  L. C.; Palmese, A.; Plazas, A.  A.; Romer, A.  K.; Roodman, A.; Rykoff, E.  S.; Sánchez, C.; Sanchez, E.; Scarpine, V.; Serrano, S.; Sevilla-Noarbe, I.; Smith, M.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M.  E. C.; Tarle, G.; Thomas, D.; Vikram, V.; Zhang, Y.

In recent years, many γ-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 γ 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 γ-ray data, obtaining a signal-to-noise ratio of 5.3. The signal is mostly localized at small angular scales and high γ-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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
• Contributing Organization: DES Collaboration
• Grant/Contract Number: AC02-76SF00515; AC02-07CH11359; AC02-06CH11357; AC05-00OR22725; AST-1138766; AST-1536171; 2017-14-H.0; GO8-19101A; CE110001020
• OSTI ID: 1603810
• Alternate ID(s): OSTI ID: 1561550; OSTI ID: 1633959; OSTI ID: 1659593; OSTI ID: 1764111
• Report Number(s): arXiv:1907.13484; FERMILAB-PUB-19-615-AE-SCD; 101102
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 124 Journal Issue: 10; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Gamma ray astronomy
Large scale structure of the Universe
Particle dark matter