Search for gamma-ray line features from Milky Way satellites with Fermi-LAT Pass 8 data

Abstract

With 91 months of the publicly available Fermi-LAT Pass 8 data, we analyze the gamma-ray emission from the Milky Way satellites to search for potential line signals due to the annihilation of dark matter particles into double photons. The searched targets include a sample of dwarf spheroidal galaxies, the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC). No significant line emission has been found neither in the stacked dwarf galaxy sample nor in the direction of LMC/SMC. The corresponding upper limits on the cross section of DM annihilation into two photons are derived. Compared with results of previous gamma-ray line searches with the Pass 7 data, the current constraints on the line emission from dwarf spheroidal galaxies has been significantly improved in a wide energy range. With the rapid increase of the sample of dwarf spheroidal galaxies (candidates), we expect that the sensitivity of gamma ray line searches will be significantly improved in the near future.

9 pages, 3 figures

References in corpus (16)

• Background model systematics for the Fermi GeV excess
• A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope
• Dwarf galaxy annihilation and decay emission profiles for dark matter experiments
• GeV excess in the Milky Way: The Role of Diffuse Galactic gamma ray Emission template
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• A New Faint Milky Way Satellite Discovered in the Pan-STARRS1 3 pi Survey
• Fermi 130 GeV gamma-ray excess and dark matter annihilation in sub-haloes and in the Galactic centre
• A Hero's Dark Horse: Discovery of an Ultra-Faint Milky Way Satellite in Pegasus
• Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies
• Search for 100 MeV to 10 GeV gamma-ray lines in the Fermi-LAT data and implications for gravitino dark matter in the $\mu \nu$SSM
• Extracting limits on Dark Matter annihilation from gamma-ray observations towards dwarf spheroidal galaxies
• Dark matter line search using a joint analysis of dwarf galaxies with the Fermi Gamma-ray Space Telescope
• Search for Gamma-ray Emission from Dark Matter Annihilation in the Large Magellanic Cloud with the Fermi Large Area Telescope
• Search with EGRET for a Gamma Ray Line from the Galactic Center
• Searching for Dark Matter Annihilation in the Smith High-Velocity Cloud
• Interpretations of the possible 42.7 GeV $\gamma$-ray line

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• Search for gamma-ray emission from the 12 nearby dwarf spheroidal galaxies with 12 years of Fermi-LAT data
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