Machine-Learned Dark Matter Subhalo Candidates in the 4FGL-DR2: Search for the Perturber of the GD-1 Stream

Abstract

The detection of dark matter subhalos without a stellar component in the Galactic halo remains a challenge. We use supervised machine learning to identify high-latitude gamma-ray sources with dark matter-like spectra among unassociated gamma-ray sources in the 4FGL-DR2. Out of 843 4FGL-DR2 unassociated sources at $|b|\ge 10{}^{\circ }$, we select 73 dark matter subhalo candidates. Of the 69 covered by the Neil Gehrels Swift Observatory (Swift), 17 show at least one X-ray source within the 95% LAT error ellipse and 52 where we identify no new sources. This latest inventory of dark subhalos candidates allows us to investigate the possible dark matter substructure responsible for the perturbation in the GD-1 stellar stream. In particular, we examine the possibility that the alleged GD-1 dark subhalo may appear as a 4FGL-DR2 gamma-ray source from dark matter annihilation into Standard Model particles.

arXiv comment17 pages, 4 figures, 2 tables, resubmitted to JCAP, comments welcome!

References in corpus (53)

• XGBoost: A Scalable Tree Boosting System
• SMOTE: Synthetic Minority Over-sampling Technique
• Where are the missing galactic satellites?
• The Aquarius Project: the subhalos of galactic halos
• Fermi Large Area Telescope Fourth Source Catalog
• The Faintest Dwarf Galaxies
• Detection of massive tidal tails around the globular cluster Pal 5 with SDSS commissioning data
• Dark matter substructure and gamma-ray annihilation in the Milky Way halo
• Fermi-LAT Observations of High-Energy Gamma-Ray Emission Toward the Galactic Center
• Evidence from the H3 Survey that the Stellar Halo is Entirely Comprised of Substructure
• Cosmological dark matter annihilations into gamma-rays - a closer look
• Tango for three: Sagittarius, LMC, and the Milky Way
• Uncovering CDM halo substructure with tidal streams
• Possible Evidence For Dark Matter Annihilation In The Inner Milky Way From The Fermi Gamma Ray Space Telescope
• How Lumpy is the Milky Way's Dark Matter Halo?
• 2SXPS: An improved and expanded Swift X-ray telescope point source catalog
• Clumpy Streams from Clumpy Halos: Detecting Missing Satellites with Cold Stellar Structures
• Tidal Tails of Star Clusters
• The number and size of subhalo-induced gaps in stellar streams
• Search for Dark Matter Satellites using the FERMI-LAT
• Swift X-ray Telescope Monitoring of Fermi-LAT Gamma Ray Sources of Interest
• Dark Matter Sub-Halo Counts via Star Stream Crossings
• Sensitivity Projections for Dark Matter Searches with the Fermi Large Area Telescope
• Off the beaten path: Gaia reveals GD-1 stars outside of the main stream
• Quantifying the impact of the Large Magellanic Cloud on the structure of the Milky Way's dark matter halo using Basis Function Expansions
• Classification and Ranking of Fermi LAT Gamma-ray Sources from the 3FGL Catalog using Machine Learning Techniques
• Properties of Dark Subhaloes from Gaps in Tidal Streams
• Star Stream Folding by Dark Galactic Sub-Halos
• The Pal 5 Star Stream Gaps
• Gaps in the GD-1 Star Stream
• Feeling the pull, a study of natural Galactic accelerometers. I: photometry of the delicate stellar stream of the Palomar 5 globular cluster
• 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
• Dark Matter Subhalos In the Fermi First Source Catalog
• Predicted Extension of the Sagittarius Stream to the Milky Way Virial Radius
• Can Astrophysical Gamma Ray Sources Mimic Dark Matter Annihilation in Galactic Satellites?
• Searching a Thousand Radio Pulsars for Gamma-ray Emission
• Examining The Fermi-LAT Third Source Catalog In Search Of Dark Matter Subhalos
• 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
• High-resolution spectroscopy of the GD-1 stellar stream localizes the perturber near the orbital plane of Sagittarius
• Searching For Dark Matter Subhalos In the Fermi-LAT Second Source Catalog
• A closer look at the spur, blob, wiggle, and gaps in GD-1
• Dark matter subhaloes as gamma-ray sources and candidates in the first Fermi-LAT catalogue
• The highest-speed local dark matter particles come from the Large Magellanic Cloud
• Realistic estimation for the detectability of dark matter sub-halos with Fermi-LAT
• Population syntheses of millisecond pulsars from the Galactic Disk and Bulge
• Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope
• Is The Gamma-Ray Source 3FGL J2212.5+0703 A Dark Matter Subhalo?
• Spectral and spatial analysis of the dark matter subhalo candidates among Fermi Large Area Telescope unidentified sources
• Modeling GD-1 Gaps in a Milky-Way Potential
• Two Rapidly Variable Galactic X-ray Transients Observed with Chandra, XMM and Suzaku
• Gamma-ray sensitivity to dark matter subhalo modelling at high latitudes