Sommerfeld-Enhanced $J$-Factors For Dwarf Spheroidal Galaxies

Abstract

For models in which dark matter annihilation is Sommerfeld-enhanced, the annihilation cross section increases at low relative velocities. Dwarf spheroidal galaxies (dSphs) have low characteristic dark matter particle velocities and are thus ideal candidates to study such models. In this paper we model the dark matter phase space of dSphs as isotropic and spherically-symmetric, and determine the $J$-factors for several of the most important targets for indirect dark matter searches. For Navarro-Frenk-White density profiles, we quantify the scatter in the $J$-factor arising from the astrophysical uncertainty in the dark matter potential. We show that, in Sommerfeld-enhanced models, the ordering of the most promising dSphs may be different relative to the standard case of velocity-independent cross sections. This result can have important implications for derived upper limits on the annihilation cross section, or on possible signals, from dSphs.

19 pages, 7 figures, 1 table; v2: published version

References in corpus (9)

• A Theory of Dark Matter
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Dwarf galaxy annihilation and decay emission profiles for dark matter experiments
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• Indirect Dark Matter Detection from Dwarf Satellites: Joint Expectations from Astrophysics and Supersymmetry
• Indirect Dark Matter Detection Limits from the Ultra-Faint Milky Way Satellite Segue 1
• Estimating the GeV Emission of Millisecond Pulsars in Dwarf Spheroidal Galaxies
• Dwarf spheroidal J-factors without priors: A likelihood-based analysis for indirect dark matter searches

Cited by in corpus (39)

• Gravitational probes of dark matter physics
• A Global Analysis of Dark Matter Signals from 27 Dwarf Spheroidal Galaxies using 11 Years of Fermi-LAT Observations
• Dark Matter in Dwarf Spheroidal Galaxies and Indirect Detection: A Review
• Last Electroweak WIMP Standing: Pseudo-Dirac Higgsino Status and Compact Stars as Future Probes
• Anatomy of Eddington-like inversion methods in the context of dark matter searches
• Structure Formation Models Weaken Limits on WIMP Dark Matter from Dwarf Spheroidal Galaxies
• On velocity-dependent dark matter annihilations in dwarf satellites
• Effective $J$-factors for Milky Way dwarf spheroidal galaxies with velocity-dependent annihilation
• The Effective J-Factor of the Galactic Center for Velocity-Dependent Dark Matter Annihilation
• Model-independent constraints on dark matter annihilation in dwarf spheroidal galaxies
• Predicting the dark matter velocity distribution in galactic structures: tests against hydrodynamic cosmological simulations
• Constraint on the velocity dependent dark matter annihilation cross section from gamma-ray and kinematic observations of ultrafaint dwarf galaxies
• Velocity-dependent J-factors for annihilation radiation from cosmological simulations
• $\chi$aro$\nu$: a tool for neutrino flux generation from WIMPs
• Entering the Era of Dark Matter Astronomy? Near to Long-Term Forecasts in X-Ray and Gamma-Ray Bands
• Angular distribution of gamma-ray emission from velocity-dependent dark matter annihilation in subhalos
• $J$-factors for self-interacting dark matter in 20 dwarf spheroidal galaxies
• Indirect searches for dark matter bound state formation and level transitions
• MADHAT: Model-Agnostic Dark Halo Analysis Tool
• Towards a more rigorous treatment of uncertainties on the velocity distribution of dark matter particles for capture in stars
• Enhanced n-body annihilation of dark matter and its indirect signatures
• Constraints on the Sommerfeld-enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies
• Two-integral distribution functions in axisymmetric galaxies: implications for dark matter searches
• Indirect Detection of Sub-GeV Dark Matter Coupling to Quarks
• $J$-factors for Velocity-dependent Dark Matter
• Sommerfeld-enhanced dark matter searches with dwarf spheroidal galaxies
• New dark matter analysis of Milky Way dwarf satellite galaxies with MADHATv2
• Velocity-dependent annihilation radiation from dark matter subhalos in cosmological simulations
• Classification of gamma-ray targets for velocity-dependent and subhalo-boosted dark-matter annihilation
• "Non-Local" Effects from Boosted Dark Matter in Indirect Detection
• Constraining $p$-wave Dark Matter Annihilation with Gamma-ray Observations of M87
• Constraining Dark Matter Microphysics with the Annihilation Signal from Subhalos
• Searching for velocity-dependent dark matter annihilation signals from extragalactic halos
• Velocity-dependent J-factors for Milky Way dwarf spheroidal analogues in cosmological simulations
• The Velocity-Dependent $J$-factor of the Milky Way Halo: Does What Happens in the Galactic Bulge Stay in the Galactic Bulge?
• Prospects for measuring dark matter microphysics with observations of dwarf spheroidal galaxies
• Analytical insight into dark matter subhalo boost factors for Sommerfeld-enhanced $s$- and $p$-wave $\gamma$-ray signals
• Consistent explanation for the cosmic-ray positron excess in p-wave Sommerfeld-enhanced dark matter annihilation
• Searching for dark matter annihilating into light long-lived mediators from stars inside dwarf spheroidal galaxies