3FGL Demographics Outside the Galactic Plane using Supervised Machine Learning: Pulsar and Dark Matter Subhalo Interpretations

Abstract

Nearly 1/3 of the sources listed in the Third Fermi Large Area Telescope (LAT) catalog (3FGL) remain unassociated. It is possible that predicted and even unanticipated gamma-ray source classes are present in these data waiting to be discovered. Taking advantage of the excellent spectral capabilities achieved by the Fermi LAT, we use machine learning classifiers (Random Forest and XGBoost) to pinpoint potentially novel source classes in the unassociated 3FGL sample outside the Galactic plane. Here we report a total of 34 high-confidence Galactic candidates at |b| > 5 degrees. The currently favored standard astrophysical interpretations for these objects are pulsars or low-luminosity globular clusters hosting millisecond pulsars (MSPs). Yet, these objects could also be interpreted as dark matter annihilation taking place in ultra-faint dwarf galaxies or dark matter subhalos. Unfortunately, Fermi LAT spectra are not sufficient to break degeneracies between the different scenarios. Careful visual inspection of archival optical images reveals no obvious evidence for low-luminosity globular clusters or ultra-faint dwarf galaxies inside the 95% error ellipses. If these are pulsars, this would bring the total number of MSPs at |b| > 5 degrees to 106. We find this number to be in excellent agreement with predictions from a new population synthesis of MSPs that predicts 100-126 high-latitude 3FGL MSPs depending on the choice of high-energy emission model. If, however, these are dark matter substructures, we can place upper limits on the number of Galactic subhalos surviving today and on dark matter annihilation cross sections. These limits are beginning to approach the canonical thermal relic cross section for dark matter particle masses below ~100 GeV in the bottom quark annihilation channel.

arXiv comment9 pages, 6 figures, 3 tables, accepted for publication in ApJ

References in corpus (62)

• SMOTE: Synthetic Minority Over-sampling Technique
• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Planck 2013 results. XVI. Cosmological parameters
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• The Aquarius Project: the subhalos of galactic halos
• Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data
• On The Origin Of The Gamma Rays From The Galactic Center
• The Characterization of the Gamma-Ray Signal from the Central Milky Way: A Compelling Case for Annihilating Dark Matter
• Detection of a Gamma-Ray Source in the Galactic Center Consistent with Extended Emission from Dark Matter Annihilation and Concentrated Astrophysical Emission
• Background model systematics for the Fermi GeV excess
• Dark matter substructure and gamma-ray annihilation in the Milky Way halo
• Dark Matter and Pulsar Model Constraints from Galactic Center Fermi-LAT Gamma Ray Observations
• Fermi-LAT Observations of High-Energy Gamma-Ray Emission Toward the Galactic Center
• A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?
• Strong support for the millisecond pulsar origin of the Galactic center GeV excess
• 2FHL: The Second Catalog of Hard Fermi-LAT Sources
• Evidence for Unresolved Gamma-Ray Point Sources in the Inner Galaxy
• High-Altitude Particle Acceleration and Radiation in Pulsar Slot Gaps
• The flattening of the concentration-mass relation towards low halo masses and its implications for the annihilation signal boost
• Possible Evidence For Dark Matter Annihilation In The Inner Milky Way From The Fermi Gamma Ray Space Telescope
• Light Curve Templates and Galactic Distribution of RR Lyrae Stars from Sloan Digital Sky Survey Stripe 82
• Extended Acceleration in Slot Gaps and Pulsar High-Energy Emission
• Clumpy Neutralino Dark Matter
• Characterization of subhalo structural properties and implications for dark matter annihilation signals
• Pass 8: Toward the Full Realization of the Fermi-LAT Scientific Potential
• Cosmic Ray Protons in the Inner Galaxy and the Galactic Center Gamma-Ray Excess
• Search for Dark Matter Satellites using the FERMI-LAT
• A New Probe of Dark Matter and High-Energy Universe Using Microlensing
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• Disrupted Globular Clusters Can Explain the Galactic Center Gamma Ray Excess
• Neutralino annihilation into gamma-rays in the Milky Way and in external galaxies
• Millisecond pulsars and the Galactic Center gamma-ray excess: the importance of luminosity function and secondary emission
• The discovery of two extremely low luminosity Milky Way globular clusters
• Classification and Ranking of Fermi LAT Gamma-ray Sources from the 3FGL Catalog using Machine Learning Techniques
• Population synthesis of radio and gamma-ray millisecond pulsars from the Galactic disk
• Gamma rays from ultracompact primordial dark matter minihalos
• Are we there yet? Time to detection of nanohertz gravitational waves based on pulsar-timing array limits
• Millisecond pulsar interpretation of the Galactic center gamma-ray excess
• Parkes radio searches of Fermi gamma-ray sources and millisecond pulsar discoveries
• Identification of the High-Energy Gamma-Ray Source 3FGL J1544.6-1125 as a Transitional Millisecond Pulsar Binary in an Accreting State
• Discovery of VVV CL001. A Low-Mass Globular Cluster Next to UKS~1 in the Direction of the Galactic Bulge
• Exploring Dark Matter with Milky Way substructure
• Dark matter vs. Pulsars: Catching the impostor
• Fermi's Sibyl: Mining the gamma-ray sky for dark matter subhaloes
• Stringent Constraints On The Dark Matter Annihilation Cross Section From Subhalo Searches With The Fermi Gamma-Ray Space Telescope
• Einstein@Home discovery of four young gamma-ray pulsars in Fermi LAT data
• Dark Matter Subhalos In the Fermi First Source Catalog
• Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos
• Can Astrophysical Gamma Ray Sources Mimic Dark Matter Annihilation in Galactic Satellites?
• Examining The Fermi-LAT Third Source Catalog In Search Of Dark Matter Subhalos
• First visual orbit for the prototypical colliding-wind binary WR 140
• Searching For Dark Matter Subhalos In the Fermi-LAT Second Source Catalog
• MACHO Project Photometry of RR Lyrae Stars in the Sgr Dwarf Galaxy
• Pair-Starved Pulsar Magnetospheres
• Young and Millisecond Pulsar GeV Gamma-ray Fluxes from the Galactic Center and Beyond

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• Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
• Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
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• Harnessing the Population Statistics of Subhalos to Search for Annihilating Dark Matter
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• Deeper analysis of Fermi-LAT unassociated 4FGL J2112.5-3043 for possible identification
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• Machine-Learned Dark Matter Subhalo Candidates in the 4FGL-DR2: Search for the Perturber of the GD-1 Stream
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