GraphNPE recovers a significantly lower central density for Boötes I consistent with a core while Draco remains marginally cuspy, and demonstrates that higher-order velocity moments reduce bias in dynamical modeling.
Pace and L.E
2 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Measuring the dark matter distribution in dwarf spheroidal galaxies (dSphs) from stellar kinematics is crucial for indirect dark matter searches, as these distributions set the fluxes for both dark matter annihilation (J-Factor) and decay (D-Factor). Here we produce a compilation of J and D-Factors for dSphs, including new calculations for several newly-discovered Milky Way (MW) satellites, for dSphs outside of the MW virial radius, and for M31 satellites. From this compilation we test for scaling relations between the J and D-factors and physical properties of the dSphs such as the velocity dispersion ($\sigma_{\mathrm{los}}$), the distance ($d$), and the stellar half-light radius ($r_{1/2}$). We find that the following scaling relation minimizes the residuals as compared to different functional dependencies on the observed dSphs properties $J(0.5 {\rm deg}) = 10^{17.72} \left(\sigma_{\mathrm{los}}/5\,{\rm km \, s^{-1}}\right)^4 \left(d / 100\,{\rm kpc}\right)^{-2}\left( r_{1/2}/100 \,{\rm pc} \right)^{-1}$. We find this relation has considerably smaller scatter as compared to the simpler relations that scale only as $1/d^2$. We further explore scalings with luminosity ($L_V$), and find that the data do not strongly prefer a scaling including $L_V$ as compared to a pure $1/d^2$ scaling. The scaling relations we derive can be used to estimate the J-Factor without the full dynamical analysis, and will be useful for estimating limits on particle dark matter properties from new systems that do not have high-quality stellar kinematics.
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A largely model-independent framework links dark matter annihilation, mediator decays, and semi-annihilation to both thermal freeze-out and present-day gamma-ray, neutrino, and antimatter fluxes, with benchmarks showing how their relative strengths shape observable spectra.
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Dark Matter in Draco and Bo\"otes I: Hints of a Core in an Ultra-Faint Dwarf from Simulation-Based Inference
GraphNPE recovers a significantly lower central density for Boötes I consistent with a core while Draco remains marginally cuspy, and demonstrates that higher-order velocity moments reduce bias in dynamical modeling.
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Cosmic-Ray Signatures of Annihilating and Semi-Annihilating Dark Matter via One-Step Cascades
A largely model-independent framework links dark matter annihilation, mediator decays, and semi-annihilation to both thermal freeze-out and present-day gamma-ray, neutrino, and antimatter fluxes, with benchmarks showing how their relative strengths shape observable spectra.