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Angular power spectrum of the diffuse gamma-ray emission as measured by the Fermi Large Area Telescope and constraints on its dark matter interpretation

Fornasa, Mattia and Cuoco, Alessandro and Zavala, Jesús and Gaskins, Jennifer M. and Sánchez-Conde, Miguel A. and Gomez-Vargas, German and Komatsu, Eiichiro and Linden, Tim and Prada, Francisco and Zandanel, Fabio and Morselli, Aldo (2016) Angular power spectrum of the diffuse gamma-ray emission as measured by the Fermi Large Area Telescope and constraints on its dark matter interpretation. Physical Review D, 94 (12). Art. No. 123005. ISSN 1550-7998. https://resolver.caltech.edu/CaltechAUTHORS:20161209-095519730

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Abstract

The isotropic gamma-ray background arises from the contribution of unresolved sources, including members of confirmed source classes and proposed gamma-ray emitters such as the radiation induced by dark matter annihilation and decay. Clues about the properties of the contributing sources are imprinted in the anisotropy characteristics of the gamma-ray background. We use 81 months of Pass 7 Reprocessed data from the Fermi Large Area Telescope to perform a measurement of the anisotropy angular power spectrum of the gamma-ray background. We analyze energies between 0.5 and 500 GeV, extending the range considered in the previous measurement based on 22 months of data. We also compute, for the first time, the cross-correlation angular power spectrum between different energy bins. We find that the derived angular spectra are compatible with being Poissonian, i.e. constant in multipole. Moreover, the energy dependence of the anisotropy suggests that the signal is due to two populations of sources, contributing, respectively, below and above ∼2  GeV. Finally, using data from state-of-the-art numerical simulations to model the dark matter distribution, we constrain the contribution from dark matter annihilation and decay in Galactic and extra-Galactic structures to the measured anisotropy. These constraints are competitive with those that can be derived from the average intensity of the isotropic gamma-ray background.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.94.123005DOIArticle
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.94.123005PublisherArticle
https://arxiv.org/abs/1608.07289arXivDiscussion Paper
ORCID:
AuthorORCID
Zavala, Jesús0000-0002-7051-1100
Komatsu, Eiichiro0000-0002-0136-2404
Additional Information:© 2016 American Physical Society. Received 23 August 2016; published 9 December 2016. The Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States; the Commissariat à l’Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucléaire et de Physique des Particules in France; the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy; the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan; and the K. A. Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d’Études Spatiales in France. We thank Dr. Shin’ichiro Ando for useful discussion and for providing us with the lower limits on the decay lifetime from Ref. [96]. We also thank Professor John F. Beacom for the valuable discussion during the last stages of the work. M. F. gratefully acknowledges support from the Netherlands Organization for Scientific Research (NWO) through a Vidi grant (P. I.: Dr. Shin’ichiro Ando), from the the Leverhulme Trust and the project MultiDark CSD2009-00064. The Dark Cosmology Centre is funded by the Danish National Research Foundation (DNRF). J. Z. is supported by the European Union (EU) under a Marie Curie International Incoming Fellowship, Contract No. PIIF-GA-2013-62772. J. G. acknowledges support from National Aeronautics and Space Adminstration (NASA) through Einstein Postdoctoral Fellowship Grant No. PF1-120089 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under Contract No. NAS8-03060, and from a Marie Curie International Incoming Fellowship, Contract No. PIIF-GA-2013-628997. G. A. G. V. is supported by Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) FONDECYT/POSTODOCTORADO/3160153, the Spanish MINECO’s Consolider Ingenio 2010 Programme under Grant No. MultiDark CSD2009-00064 and also partly by Ministerio de Economia (MINECO) under Grant No. FPA2012-34694. M. A. S. C. is a Wenner-Gren Fellow and acknowledges the support of the Wenner-Gren Foundations to develop his research. E. K. thanks J. U. Lange for useful discussion on the bias in CP due to binning presented in Sec. IV A. F. P. acknowledges support from the Spanish Ministerio de Competitividad y Innovacion (MICINNs) Consolider-Ingenio 2010 Programme under Grant No. MultiDark CSD2009-00064, MINECO Centro de Excelencia Severo Ochoa Programme under Grant No. SEV-2012-0249 and MINECO Grant No. AYA2014-60641-C2-1-P. F. Z. acknowledges the support of the NWO through a Veni grant.
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
High Energy Accelerator Research Organization (KEK)UNSPECIFIED
Japan Aerospace Exploration Agency (JAXA)UNSPECIFIED
Knut and Alice Wallenberg FoundationUNSPECIFIED
Swedish Research CouncilUNSPECIFIED
Swedish National Space BoardUNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Centre National d’Études Spatiales (CNES)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Leverhulme TrustUNSPECIFIED
Ministerio de Competitividad y Innovacion (MICINN)MultiDark CSD2009-00064
Danish National Research FoundationUNSPECIFIED
Marie Curie FellowshipPIIF-GA-2013-62772
NASA Einstein Postdoctoral FellowshipPF1-120089
NASANAS8-03060
Marie Curie FellowshipPIIF-GA-2013-628997
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)3160153
Ministerio de Economia (MINECO)FPA2012-34694
Wenner-Gren FoundationUNSPECIFIED
Centro de Excelencia Severo Ochoa ProgrammeSEV-2012-0249
Ministerio de Economia (MINECO)AYA2014-60641-C2-1-P
Issue or Number:12
Record Number:CaltechAUTHORS:20161209-095519730
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161209-095519730
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72689
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Dec 2016 19:42
Last Modified:09 Mar 2020 13:19

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