ExtendingFermi-LAT and H.E.S.S. limits on gamma-ray lines from dark matter annihilation
- University of California, Santa Cruz, CA (United States)
- Max-Planck-Institut fur Kernphysik, Heidelberg (Germany)
Gamma-ray lines from dark matter annihilation (χχ → γX, where X = γ, h, Z) are always accompanied, at lower energies, by a continuum gamma-ray spectrum stemming both from radiative corrections (X = γ) and from the decay debris of the second particle possibly present in the final state (X = h, Z). This model-independent gamma-ray emission can be exploited to derive novel limits on gamma-ray lines that do not rely on the line feature. Although such limits are not expected to be as stringent as those based on the line feature, they can be used to probe the existence of gamma-ray lines for dark matter masses beyond the largest energies accessible to current telescopes. In this report we use continuous gamma-ray searches from Fermi-LAT observations of Milky Way dwarf spheroidal galaxies and from H.E.S.S. observations of the Galactic halo to extend the limits on the annihilation cross-sections into monochromatic photons to dark matter masses well beyond 500 GeV (Fermi-LAT) and 20 TeV (H.E.S.S.). In this large-mass regime, our results provide the first constraints on gamma-ray lines from dark matter annihilation.
- Research Organization:
- Univ. of California, Santa Cruz, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0010107
- OSTI ID:
- 1535661
- Journal Information:
- Monthly Notices of the Royal Astronomical Society, Vol. 461, Issue 4; ISSN 0035-8711
- Publisher:
- Oxford University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Singlet-triplet fermionic dark matter and LHC phenomenology
|
journal | April 2018 |
| Muon Magnetic Moment and Lepton Flavor Violation in the Economical 3-3-1 Model | preprint | January 2017 |
| Search for line signal candidates in the Fermi-LAT data | text | January 2018 |
| Secluded Dark Matter in light of the Cherenkov Telescope Array (CTA) | text | January 2019 |
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