Examining The Fermi-LAT Third Source Catalog In Search Of Dark Matter Subhalos

Abstract

Dark matter annihilations taking place in nearby subhalos could appear as gamma-ray sources without detectable counterparts at other wavelengths. In this study, we consider the collection of unassociated gamma-ray sources reported by the Fermi Collaboration in an effort to identify the most promising dark matter subhalo candidates. While we identify 24 bright, high-latitude, non-variable sources with spectra that are consistent with being generated by the annihilations of ~20-70 GeV dark matter particles (assuming annihilations to $b\bar{b}$), it is not possible at this time to distinguish these sources from radio-faint gamma-ray pulsars. Deeper multi-wavelength observations will be essential to clarify the nature of these sources. It is notable that we do not find any such sources that are well fit by dark matter particles heavier than ~100 GeV. We also study the angular distribution of the gamma-rays from this set of subhalo candidates, and find that the source 3FGL J2212.5+0703 prefers a spatially extended profile (of width ~0.15${}^{\circ }$) over that of a point source, with a significance of 4.2$\sigma$ (3.6$\sigma$ after trials factor). Although not yet definitive, this bright and high-latitude gamma-ray source is well fit as a nearby subhalo of $m_{\chi }\simeq$ 20-50 GeV dark matter particles (annihilating to $b\bar{b}$) and merits further multi-wavelength investigation. Based on the subhalo distribution predicted by numerical simulations, we derive constraints on the dark matter annihilation cross section that are competitive to those resulting from gamma-ray observations of dwarf spheroidal galaxies, the Galactic Center, and the extragalactic gamma-ray background.

15 pages, 11 figures

References in corpus (16)

• An Introduction to PYTHIA 8.2
• Background model systematics for the Fermi GeV excess
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• Possible Evidence For Dark Matter Annihilation In The Inner Milky Way From The Fermi Gamma Ray Space Telescope
• Search for Gamma-Ray Emission from DES Dwarf Spheroidal Galaxy Candidates with Fermi-LAT Data
• Fermi Large Area Telescope Third Source Catalog
• The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST
• Limits on Dark Matter Annihilation Signals from the Fermi LAT 4-year Measurement of the Isotropic Gamma-Ray Background
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• Dark Matter Annihilation in Substructures Revised
• Composition of the Fermi-LAT isotropic gamma-ray background intensity: Emission from extragalactic point sources and dark matter annihilations
• Radio Searches of Fermi LAT Sources and Blind Search Pulsars: The Fermi Pulsar Search Consortium
• Search for Gamma-ray Emission from Dark Matter Annihilation in the Large Magellanic Cloud with the Fermi Large Area Telescope
• A Micromegas-based low-background x-ray detector coupled to a slumped-glass telescope for axion research
• TASI 2014 Lectures: The Hunt for Dark Matter

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• Gravitational wave probes of dark matter: challenges and opportunities
• NLO+NLL Collider Bounds, Dirac Fermion and Scalar Dark Matter in the B-L Model
• Dark Matter in Dwarf Spheroidal Galaxies and Indirect Detection: A Review
• The Extragalactic Gamma-ray Sky in the Fermi era
• 3FGL Demographics Outside the Galactic Plane using Supervised Machine Learning: Pulsar and Dark Matter Subhalo Interpretations
• Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
• Realistic estimation for the detectability of dark matter sub-halos with Fermi-LAT
• Primordial Black Holes as Silver Bullets for New Physics at the Weak Scale
• Is The Gamma-Ray Source 3FGL J2212.5+0703 A Dark Matter Subhalo?
• Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope
• Dark matter subhalos and unidentified sources in the Fermi 3FGL source catalog
• Spectral and spatial analysis of the dark matter subhalo candidates among Fermi Large Area Telescope unidentified sources
• Gamma Rays From Dark Matter Subhalos Revisited: Refining the Predictions and Constraints
• p-wave Annihilating Dark Matter from a Decaying Predecessor and the Galactic Center Excess
• Constraining Galactic dark matter with gamma-ray pixel counts statistics
• $\gamma$-ray and $\nu$ searches for dark matter subhalos in the Milky Way with a baryonic potential
• Updated Collider and Direct Detection Constraints on Dark Matter Models for the Galactic Center Gamma-Ray Excess
• TeV Dark Matter Searches in the Extragalactic Gamma-Ray Sky
• Investigating the detection of dark matter subhalos as extended sources with Fermi-LAT
• Fermi Study of gamma-ray Millisecond Pulsars: the Spectral Shape and Pulsed 25--200 GeV Emission from J0614-3329
• Sensitivity of the Cherenkov Telescope Array to dark subhalos
• 3FGL J1924.8-1034 : A Spatially-Extended Stable Unidentified GeV Source?
• Gamma-ray sensitivity to dark matter subhalo modelling at high latitudes
• Search for dark matter annihilation signals from unidentified Fermi-LAT objects with H.E.S.S
• Testing the dark matter subhalo hypothesis of the gamma-ray source 3FGL J2212.5+0703
• Limits on Dark Matter annihilation cross sections to gamma-ray lines with subhalo distribution in N-body simulation and Fermi LAT data
• Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies
• Gamma-ray spectral properties of the Galactic globular clusters: constraint on the numbers of millisecond pulsars
• Spatial extension of dark subhalos as seen by Fermi-LAT and implications for WIMP constraints
• Harnessing the Population Statistics of Subhalos to Search for Annihilating Dark Matter
• Multimessenger TeV Dark Matter: a mini review
• A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter
• Constraints to dark matter annihilation from high-latitude HAWC unidentified sources
• A search for dark matter among Fermi-LAT unidentified sources with systematic features in Machine Learning
• Search for line signal candidates in the Fermi-LAT data
• Searching for dark matter subhalos in the Fermi-LAT catalog with Bayesian neural networks
• Can prompt cusps of WIMP dark matter be detected as individual gamma-ray sources?
• Statistics for dark matter subhalo searches in gamma rays from a kinematically constrained population model: Fermi-LAT-like telescopes
• Identification of Candidate Millisecond Pulsars from Fermi LAT Observations
• Identification of Candidate Millisecond Pulsars from Fermi LAT Observations II
• Searching for Gamma-Ray Millisecond Pulsars: Selection of Candidates Revisited
• Machine-Learned Dark Matter Subhalo Candidates in the 4FGL-DR2: Search for the Perturber of the GD-1 Stream
• Extragalactic Searches for Dark Matter Annihilation