Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters

Dugger, Leanna; Profumo, Stefano

doi:10.1088/1475-7516/2010/12/015

Title: Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters

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Abstract

We analyze the impact of Fermi gamma-ray observations (primarily non-detections) of selected nearby galaxies, including dwarf spheroidals, and of clusters of galaxies on decaying dark matter models. We show that the fact that galaxy clusters do not shine in gamma rays puts the most stringent limits available to-date on the lifetime of dark matter particles for a wide range of particle masses and decay final states. In particular, our results put strong constraints on the possibility of ascribing to decaying dark matter both the increasing positron fraction reported by PAMELA and the high-energy feature in the electron-positron spectrum measured by Fermi. Observations of nearby dwarf galaxies and of the Andromeda Galaxy (M31) do not provide as strong limits as those from galaxy clusters, while still improving on previous constraints in some cases.

Authors:

Dugger, Leanna; Profumo, Stefano ^[1]

Department of Astronomy and Department of Physics, University of California Berkeley, 601 Campbell Hall, Berkeley, CA (United States)

Publication Date:: Wed Dec 01 00:00:00 EST 2010

OSTI Identifier:: 22275412

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2010; Journal Issue: 12; 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; ASTROPHYSICS; COSMIC ELECTRONS; COSMIC POSITRONS; COSMOLOGY; GALAXIES; GALAXY CLUSTERS; GAMMA SPECTROSCOPY; LIFETIME; LIMITING VALUES; NONLUMINOUS MATTER; PARTICLE DECAY

Citation Formats


                    Dugger, Leanna, Profumo, Stefano, and Jeltema, Tesla E., E-mail: greentee01@gmail.com, E-mail: tesla@ucolick.org, E-mail: profumo@scipp.ucsc.edu. Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters.  United States: N. p., 2010. 
        Web.  doi:10.1088/1475-7516/2010/12/015.

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                    Dugger, Leanna, Profumo, Stefano, & Jeltema, Tesla E., E-mail: greentee01@gmail.com, E-mail: tesla@ucolick.org, E-mail: profumo@scipp.ucsc.edu. Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters.  United States.  https://doi.org/10.1088/1475-7516/2010/12/015

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                    Dugger, Leanna, Profumo, Stefano, and Jeltema, Tesla E., E-mail: greentee01@gmail.com, E-mail: tesla@ucolick.org, E-mail: profumo@scipp.ucsc.edu. 2010.  
        "Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters".  United States.  https://doi.org/10.1088/1475-7516/2010/12/015.

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@article{osti_22275412,

  title        = {Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters},

  author       = {Dugger, Leanna and Profumo, Stefano and Jeltema, Tesla E., E-mail: greentee01@gmail.com, E-mail: tesla@ucolick.org, E-mail: profumo@scipp.ucsc.edu},

  abstractNote = {We analyze the impact of Fermi gamma-ray observations (primarily non-detections) of selected nearby galaxies, including dwarf spheroidals, and of clusters of galaxies on decaying dark matter models. We show that the fact that galaxy clusters do not shine in gamma rays puts the most stringent limits available to-date on the lifetime of dark matter particles for a wide range of particle masses and decay final states. In particular, our results put strong constraints on the possibility of ascribing to decaying dark matter both the increasing positron fraction reported by PAMELA and the high-energy feature in the electron-positron spectrum measured by Fermi. Observations of nearby dwarf galaxies and of the Andromeda Galaxy (M31) do not provide as strong limits as those from galaxy clusters, while still improving on previous constraints in some cases.},

  doi          = {10.1088/1475-7516/2010/12/015},

  url          = {https://www.osti.gov/biblio/22275412},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 12,

  volume       = 2010,

  place        = {United States},

  year         = {Wed Dec 01 00:00:00 EST 2010},

  month        = {Wed Dec 01 00:00:00 EST 2010}

}

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