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Title: Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT

Abstract

We report on a search for monochromatic γ-ray features in the spectra of galaxy clusters observed by the Fermi Large Area Telescope. Galaxy clusters are the largest structures in the Universe that are bound by dark matter (DM), making them an important testing ground for possible self-interactions or decays of the DM particles. Monochromatic γ-ray lines provide a unique signature due to the absence of astrophysical backgrounds and are as such considered a smoking-gun signature for new physics. An unbinned joint likelihood analysis of the sixteen most promising clusters using five years of data at energies between 10 and 400 GeV revealed no significant features. For the case of self-annihilation, we set upper limits on the monochromatic velocity-averaged interaction cross section. These limits are compatible with those obtained from observations of the Galactic Center, albeit weaker due to the larger distance to the studied clusters.

Authors:
; ; ;  [1];  [2]
  1. The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm (Sweden)
  2. Georg-August University Göttingen, Institute for theoretical Physics—Faculty of Physics, Friedrich-Hund-Platz 1, D-37077 Göttingen (Germany)
Publication Date:
OSTI Identifier:
22525015
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2016; Journal Issue: 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ASTROPHYSICS; CROSS SECTIONS; DISTANCE; GALAXY CLUSTERS; GAMMA RADIATION; GEV RANGE; MILKY WAY; MONOCHROMATIC RADIATION; NONLUMINOUS MATTER; PARTICLE DECAY; TELESCOPES; UNIVERSE

Citation Formats

Anderson, B., Zimmer, S., Conrad, J., Sánchez-Conde, M., Gustafsson, M., and Caputo, R., E-mail: brandon.anderson@fysik.su.se, E-mail: stephan.zimmer@fysik.su.se, E-mail: conrad@fysik.su.se, E-mail: michael.gustafsson@theorie.physik.uni-goettingen.de, E-mail: sanchezconde@fysik.su.se, E-mail: rcaputo@ucsc.edu. Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/02/026.
Anderson, B., Zimmer, S., Conrad, J., Sánchez-Conde, M., Gustafsson, M., & Caputo, R., E-mail: brandon.anderson@fysik.su.se, E-mail: stephan.zimmer@fysik.su.se, E-mail: conrad@fysik.su.se, E-mail: michael.gustafsson@theorie.physik.uni-goettingen.de, E-mail: sanchezconde@fysik.su.se, E-mail: rcaputo@ucsc.edu. Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT. United States. doi:10.1088/1475-7516/2016/02/026.
Anderson, B., Zimmer, S., Conrad, J., Sánchez-Conde, M., Gustafsson, M., and Caputo, R., E-mail: brandon.anderson@fysik.su.se, E-mail: stephan.zimmer@fysik.su.se, E-mail: conrad@fysik.su.se, E-mail: michael.gustafsson@theorie.physik.uni-goettingen.de, E-mail: sanchezconde@fysik.su.se, E-mail: rcaputo@ucsc.edu. Mon . "Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT". United States. doi:10.1088/1475-7516/2016/02/026.
@article{osti_22525015,
title = {Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT},
author = {Anderson, B. and Zimmer, S. and Conrad, J. and Sánchez-Conde, M. and Gustafsson, M. and Caputo, R., E-mail: brandon.anderson@fysik.su.se, E-mail: stephan.zimmer@fysik.su.se, E-mail: conrad@fysik.su.se, E-mail: michael.gustafsson@theorie.physik.uni-goettingen.de, E-mail: sanchezconde@fysik.su.se, E-mail: rcaputo@ucsc.edu},
abstractNote = {We report on a search for monochromatic γ-ray features in the spectra of galaxy clusters observed by the Fermi Large Area Telescope. Galaxy clusters are the largest structures in the Universe that are bound by dark matter (DM), making them an important testing ground for possible self-interactions or decays of the DM particles. Monochromatic γ-ray lines provide a unique signature due to the absence of astrophysical backgrounds and are as such considered a smoking-gun signature for new physics. An unbinned joint likelihood analysis of the sixteen most promising clusters using five years of data at energies between 10 and 400 GeV revealed no significant features. For the case of self-annihilation, we set upper limits on the monochromatic velocity-averaged interaction cross section. These limits are compatible with those obtained from observations of the Galactic Center, albeit weaker due to the larger distance to the studied clusters.},
doi = {10.1088/1475-7516/2016/02/026},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 02,
volume = 2016,
place = {United States},
year = {2016},
month = {2}
}

Works referencing / citing this record:

Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
journal, July 2019