3FGL J1924.8-1034 : A Spatially-Extended Stable Unidentified GeV Source?

Abstract

Milky Way-like galaxies are predicted to host a very large number of dark matter subhalos. Some massive and nearby subhalos could generate detectable gamma-rays, appearing as unidentified, spatially-extended and stable gamma-ray sources. We search for such sources in the third Fermi Large Area Telescope source List (3FGL) and report the identification of a new candidate, 3FGL J1924.8-1034. With the Fermi-LAT Pass 8 data, we find that 3FGL J1924.8-1034 is spatially-extended at a high confidence level of $5.4\sigma$, with a best-fit extension radius of $\sim 0.15^{\circ }$. No significant variability has been found and its gamma-ray spectrum is well fitted by the dark matter annihilation into $b\bar{b}$ with a mass of $\sim 43$ GeV. All these facts make 3FGL J1924.8-1034 a possible dark matter subhalo candidate. However, due to the limited angular resolution, the possibility of that the spatial extension of 3FGL J1924.8-1034 is caused by the contamination from the other un-resolved point source can not be ruled out.

10 pages including 5 figures and 1 table, accepted for publication in Phys. Rev. D

References in corpus (22)

• Dark Matter Candidates from Particle Physics and Methods of Detection
• The ATNF Pulsar Catalogue
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Background model systematics for the Fermi GeV excess
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• Dark Matter and Collider Phenomenology of Universal Extra Dimensions
• The 5th edition of the Roma-BZCAT. A short presentation
• CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates
• Characterization of subhalo structural properties and implications for dark matter annihilation signals
• GeV excess in the Milky Way: The Role of Diffuse Galactic gamma ray Emission template
• The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• The shapes, orientation, and alignment of Galactic dark matter subhalos
• Sensitivity Projections for Dark Matter Searches with the Fermi Large Area Telescope
• Cosmic ray lepton puzzle in the light of cosmological N-body simulations
• Constraints on Dark Matter Annihilation/Decay from the Isotropic Gamma-Ray Background
• Is The Gamma-Ray Source 3FGL J2212.5+0703 A Dark Matter Subhalo?
• Dark matter subhalos and unidentified sources in the Fermi 3FGL source catalog
• Search for gamma-ray line features from Milky Way satellites with Fermi-LAT Pass 8 data
• Testing the dark matter subhalo hypothesis of the gamma-ray source 3FGL J2212.5+0703
• Gamma-rays From Warm WIMP Dark Matter Annihilation

Cited by in corpus (9)

• Science with e-ASTROGAM (A space mission for MeV-GeV gamma-ray astrophysics)
• Search for Spatial Extension in High-Latitude Sources Detected by the Fermi Large Area Telescope
• Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope
• Spectral and spatial analysis of the dark matter subhalo candidates among Fermi Large Area Telescope unidentified sources
• TeV Dark Matter Searches in the Extragalactic Gamma-Ray Sky
• Spatial extension of dark subhalos as seen by Fermi-LAT and implications for WIMP constraints
• A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter
• Connecting direct and indirect detection with a dark spike in the cosmic-ray electron spectrum
• Search for line signal candidates in the Fermi-LAT data