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Title: Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background

Abstract

Here, we search for evidence of dark matter (DM) annihilation in the isotropic gamma-ray background (IGRB) measured with 50 months of Fermi Large Area Telescope (LAT) observations. An improved theoretical description of the cosmological DM annihilation signal, based on two complementary techniques and assuming generic weakly interacting massive particle (WIMP) properties, renders more precise predictions compared to previous work. Moreover, we estimate the cosmologically-induced gamma-ray intensity to have an uncertainty of a factor ~ 20 in canonical setups. We consistently include both the Galactic and extragalactic signals under the same theoretical framework, and study the impact of the former on the IGRB spectrum derivation. We find no evidence for a DM signal and we set limits on the DM-induced isotropic gamma-ray signal. Our limits are competitive for DM particle masses up to tens of TeV and, indeed, are the strongest limits derived from Fermi LAT data at TeV energies. This is possible thanks to the new Fermi LAT IGRB measurement, which now extends up to an energy of 820 GeV. We also quantify uncertainties in detail and show the potential this type of search offers for testing the WIMP paradigm with a complementary and truly cosmological probe of DM particlemore » signals.« less

Authors:
 [1]
  1. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
Fermi-LAT; Fermi LAT Collaboration
OSTI Identifier:
1221230
Alternate Identifier(s):
OSTI ID: 1354915
Report Number(s):
FERMILAB-PUB-15-052-A
Journal ID: ISSN 1475-7516; arXiv eprint number arXiv:1501.05464
Grant/Contract Number:  
AC02-07CH11359; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 09; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma ray experiments; dark matter experiments; dark matter theory; gamma ray theory; dark matter simulations

Citation Formats

Ackermann, M. Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/09/008.
Ackermann, M. Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background. United States. https://doi.org/10.1088/1475-7516/2015/09/008
Ackermann, M. Wed . "Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background". United States. https://doi.org/10.1088/1475-7516/2015/09/008. https://www.osti.gov/servlets/purl/1221230.
@article{osti_1221230,
title = {Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background},
author = {Ackermann, M.},
abstractNote = {Here, we search for evidence of dark matter (DM) annihilation in the isotropic gamma-ray background (IGRB) measured with 50 months of Fermi Large Area Telescope (LAT) observations. An improved theoretical description of the cosmological DM annihilation signal, based on two complementary techniques and assuming generic weakly interacting massive particle (WIMP) properties, renders more precise predictions compared to previous work. Moreover, we estimate the cosmologically-induced gamma-ray intensity to have an uncertainty of a factor ~ 20 in canonical setups. We consistently include both the Galactic and extragalactic signals under the same theoretical framework, and study the impact of the former on the IGRB spectrum derivation. We find no evidence for a DM signal and we set limits on the DM-induced isotropic gamma-ray signal. Our limits are competitive for DM particle masses up to tens of TeV and, indeed, are the strongest limits derived from Fermi LAT data at TeV energies. This is possible thanks to the new Fermi LAT IGRB measurement, which now extends up to an energy of 820 GeV. We also quantify uncertainties in detail and show the potential this type of search offers for testing the WIMP paradigm with a complementary and truly cosmological probe of DM particle signals.},
doi = {10.1088/1475-7516/2015/09/008},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 09,
volume = 2015,
place = {United States},
year = {Wed Sep 02 00:00:00 EDT 2015},
month = {Wed Sep 02 00:00:00 EDT 2015}
}

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