130 GeV gamma-ray line through axion conversion

Masato Yamanaka, Kazunori Kohri, Kunihito Ioka, and Mihoko M. Nojiri
Phys. Rev. D 91, 063532 – Published 30 March 2015

Abstract

We apply the axion-photon conversion mechanism to the 130 GeV γ-ray line observed by the Fermi satellite. Near the Galactic center, some astrophysical sources and/or particle dark matter can produce energetic axions (or axionlike particles), and the axions convert to γ rays in Galactic magnetic fields along their flight to the Earth. Since continuum γ-ray and antiproton productions are sufficiently suppressed in axion production, the scenario fits the 130 GeV γ-ray line without conflicting with cosmic ray measurements. We derive the axion production cross section and the decay rate of dark matter to fit the γ-ray excess as functions of axion parameters. In the scenario, the γ-ray spatial distributions depend on both the dark matter profile and the magnetic field configuration, which will be tested by future γ-ray observations, e.g., H.E.S.S. II, CTA, and GAMMA-400. As an illustrative example, we study realistic supersymmetric axion models, and show the favored parameters that nicely fit the γ-ray excess.

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  • Received 6 August 2014

DOI:https://doi.org/10.1103/PhysRevD.91.063532

© 2015 American Physical Society

Authors & Affiliations

Masato Yamanaka1,2,*, Kazunori Kohri2,3,†, Kunihito Ioka2,3,‡, and Mihoko M. Nojiri2,3,§

  • 1Department of Physics, Nagoya University, Nagoya 464-8602, Japan
  • 2Theory Center, Institute of Particle and Nuclear Studies, KEK (High Energy Accelerator Research Organization), 1-1 Oho, Tsukuba 305-0801, Japan
  • 3Graduate University for Advanced Studies (Sokendai), 1-1 Oho, Tsukuba 305-0801, Japan

  • *yamanaka@eken.phys.nagoya-u.ac.jp
  • kohri@post.kek.jp
  • kunihito.ioka@kek.jp
  • §nojiri@post.kek.jp

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Vol. 91, Iss. 6 — 15 March 2015

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