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Published April 1, 2014 | Submitted
Journal Article Open

Dark matter implications of Fermi-LAT measurement of anisotropies in the diffuse gamma-ray background

Gómez-Vargas, G. A.
Cuoco, A.
Linden, T.
Sánchez-Conde, M. A.
Siegal-Gaskins, J. M.
Delahaye, T.
Fornasa, M.
Komatsu, E. ORCID icon
Prada, F.
Zavala, J. ORCID icon
Fermi-LAT Collaboration

Abstract

The detailed origin of the diffuse gamma-ray background is still unknown. However, the contribution of unresolved sources is expected to induce small-scale anisotropies in this emission, which may provide a way to identify and constrain the properties of its contributors. Recent studies have predicted the contributions to the angular power spectrum (APS) from extragalactic and galactic dark matter (DM) annihilation or decay. The Fermi-LAT collaboration reported detection of angular power with a significance larger than 3σ3σ in the energy range from 1 GeV to 10 GeV on 22 months of data (Ackermann et al., 2012 [2]). For these preliminary results the already published Fermi-LAT APS measurements (Ackermann et al., 2012 [2]) are compared to the accurate predictions for DM anisotropies from state-of-the-art cosmological simulations as presented in Fornasa et al. (2013) [1] to derive constraints on different DM candidates.

Additional Information

© 2013 Elsevier B.V. Available online 16 November 2013. This work was partially supported by the Spanish MINECO's Consolider-Ingenio 2010 Programme under Grant MultiDark CSD2009-00064. The work of GAGV was supported in part by MINECO under Grants FPA2009-08958, FPA2009-09017 and FPA2012-34694, and under the 'Centro de Excelencia Severo Ochoa' Programme SEV-2012-0249, by the Comunidad de Madrid under Grant HEPHACOS S2009/ESP-1473, and by the European Union under the Marie Curie-ITN program PITN-GA-2009-237920. GAGV thanks Caltech for hospitality during the completion of this work. The work of TD was supported in part by the ANR project DMAstroLHC, ANR-12-BS05-0006-01. JZ is supported by the University of Waterloo and the Perimeter Institute for Theoretical Physics. Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Research & Innovation. JZ acknowledges financial support by a CITA National Fellowship. The Fermi LAT Collaboration acknowledges support from a number of agencies and institutes for both development and the operation of the LAT as well as scientific data analysis. These include NASA and DOE in the United States, CEA/Irfu and IN2P3/CNRS in France, ASI and INFN in Italy, MEXT, KEK, and JAXA in Japan, and the K.A. Wallenberg Foundation, the Swedish Research Council and the National Space Board in Sweden. Additional support from INAF in Italy and CNES in France for science analysis during the operations phase is also gratefully acknowledged.

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August 22, 2023
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October 26, 2023