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 selfinteractions 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:
-
- The Oskar Klein Centre for Cosmoparticle Physics (Sweden); Stockholm Univ. (Sweden). Dept. of Physics
- Georg-August Univ. Gottingen (Germany)
- Univ. of California, Santa Cruz, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE; National Aeronautics and Space Administration (NASA); European Union (EU); Japan Aerospace Exploration Agency (JAXA); Swedish Research Council (SRC)
- OSTI Identifier:
- 1355673
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2016; Journal Issue: 02; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; dark matter experiments; galaxy clusters; gamma ray experiments
Citation Formats
Anderson, B., Zimmer, S., Conrad, J., Gustafsson, M., Sánchez-Conde, M., and Caputo, R. 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., Gustafsson, M., Sánchez-Conde, M., & Caputo, R. Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT. United States. https://doi.org/10.1088/1475-7516/2016/02/026
Anderson, B., Zimmer, S., Conrad, J., Gustafsson, M., Sánchez-Conde, M., and Caputo, R. Tue .
"Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT". United States. https://doi.org/10.1088/1475-7516/2016/02/026. https://www.osti.gov/servlets/purl/1355673.
@article{osti_1355673,
title = {Search for gamma-ray lines towards galaxy clusters with the Fermi-LAT},
author = {Anderson, B. and Zimmer, S. and Conrad, J. and Gustafsson, M. and Sánchez-Conde, M. and Caputo, R.},
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 selfinteractions 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},
number = 02,
volume = 2016,
place = {United States},
year = {Tue Feb 09 00:00:00 EST 2016},
month = {Tue Feb 09 00:00:00 EST 2016}
}
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- arXiv