The self-confinement of electrons and positrons from dark matter
arXiv:2305.01999 · doi:10.1088/1475-7516/2023/08/030
Abstract
Radiative emissions from electrons and positrons generated by dark matter (DM) annihilation or decay are one of the most investigated signals in indirect searches of WIMPs. Ideal targets must have large ratio of DM to baryonic matter. However, such ``dark'' systems have a poorly known level of magnetic turbulence, which determines the residence time of the electrons and positrons and therefore also the strength of the expected signal. This typically leads to significant uncertainties in the derived DM bounds. In a novel approach, we compute the self-confinement of the DM-induced electrons and positrons. Indeed, they themselves generate irregularities in the magnetic field, thus setting a lower limit on the presence of the magnetic turbulence. We specifically apply this approach to dwarf spheroidal galaxies. Finally, by comparing the expected synchrotron emission with radio data from the direction of the Draco galaxy collected at the Giant Metre Radio Telescope, we show that the proposed approach can be used to set robust and competitive bounds on WIMP DM.
arXiv comment18 pages, 10 figures. v2: minor revision, matches published version
References in corpus (35)
- emcee: The MCMC Hammer
- The Structure of Cold Dark Matter Halos
- The observed properties of dwarf galaxies in and around the Local Group
- The Structure of Dark Matter Haloes in Dwarf Galaxies
- WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
- The Pan-STARRS1 Database and Data Products
- The Origin of Galactic Cosmic Rays
- An Accurate Flux Density Scale from 50 MHz to 50 GHz
- Ionospheric Calibration of Low Frequency Radio Interferometric Observations using the Peeling Scheme: I. Method Description and First Results
- Spectral breaks as a signature of cosmic ray induced turbulence in the Galaxy
- Multi-frequency analysis of neutralino dark matter annihilations in the Coma cluster
- Dark matter annihilation and decay in dwarf spheroidal galaxies: The classical and ultrafaint dSphs
- The case for a cold dark matter cusp in Draco
- Multi-wavelength signals of dark matter annihilations at the Galactic center
- Self-Generated Cosmic-Ray Confinement in TeV Halos: Implications for TeV Gamma-Ray Emission and the Positron Excess
- Origin of the Cosmic Ray Galactic Halo Driven by Advected Turbulence and Self-Generated Waves
- Bayesian analysis of resolved stellar spectra: application to MMT/Hectochelle Observations of the Draco dwarf spheroidal
- How to break the density-anisotropy degeneracy in spherical stellar systems
- A Deep Search for Extended Radio Continuum Emission From Dwarf Spheroidal Galaxies: Implications for Particle Dark Matter
- To beta or not to beta: can higher-order Jeans analysis break the mass-anisotropy degeneracy in simulated dwarfs?
- Self-Generated Cosmic-Ray Turbulence Can Explain the Morphology of TeV Halos
- Dark matter in the Reticulum II dSph: a radio search
- Local Group dSph radio survey with ATCA (II): Non-thermal diffuse emission
- Local Group dSph radio survey with ATCA (III): Constraints on Particle Dark Matter
- Bounds on Dark Matter Properties from Radio Observations of Ursa Major II using the Green Bank Telescope
- On velocity-dependent dark matter annihilations in dwarf satellites
- Giant cosmic ray halos around M31 and the Milky Way
- Grammage of cosmic rays in the proximity of supernova remnants embedded in a partially ionized medium
- Constraints on dark matter annihilation in dwarf spheroidal galaxies from low frequency radio observations
- Radio constraints on dark matter annihilation in Canes Venatici I with LOFAR
- Universal profiles for radio searches of dark matter in dwarf galaxies
- Stringent constraint on the radio signal from dark matter annihilation in dwarf spheroidal galaxies using the TGSS
- Searching for Dark Matter Signals from Local Dwarf Spheroidal Galaxies at Low Radio Frequencies in the GLEAM Survey
- Upper limits on the dark matter content in globular clusters
- Weakly interacting massive particle cross section limits from LOFAR observations of dwarf spheroidal galaxies