Sub-GeV Dark Matter Annihilation: Limits from Milky Way observations with INTEGRAL

Abstract

From 16 years of INTEGRAL/SPI $\gamma$-ray observations, we derive bounds on annihilating light dark matter particles in the halo of the Milky Way up to masses of about 300 MeV. We test four different spatial templates for the dark matter halo, including a Navarro-Frenk-White (NFW), Einasto, Burkert, and isothermal sphere profile, as well as three different models for the underlying diffuse Inverse Compton emission. We find that the bounds on the s-wave velocity-averaged annihilation cross sections for both the electron-positron and the photon-photon final states are the strongest to date from $\gamma$-ray observations alone in the mass range $\lesssim 6$ MeV. We provide fitting formulae for the upper limits and discuss their dependences on the halo profile. The bounds on the two-photon final state are superseding the limits from the Cosmic Microwave Background in the range of 50 keV up to $\sim 3$ MeV, showing the great potential future MeV mission will have in probing light dark matter.

6 pages, 6 figures, appendix, accepted by MNRAS

References in corpus (32)

• A Universal Density Profile from Hierarchical Clustering
• Supersymmetric Dark Matter
• The Structure of Dark Matter Haloes in Dwarf Galaxies
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Indirect Dark Matter Signatures in the Cosmic Dark Ages I. Generalizing the Bound on s-wave Dark Matter Annihilation from Planck
• Constraining Light Dark Matter with Diffuse X-Ray and Gamma-Ray Observations
• INTEGRAL constraints on primordial black holes and particle dark matter
• Gamma-Ray Constraint on Galactic Positron Production by MeV Dark Matter
• The interstellar cosmic-ray electron spectrum from synchrotron radiation and direct measurements
• Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• Gamma-ray spectroscopy of Positron Annihilation in the Milky Way
• INTEGRAL SPI All-Sky View in Soft Gamma Rays: Study of Point Source and Galactic Diffuse Emissions
• Novel cosmic-ray electron and positron constraints on MeV dark matter particles
• Diffuse emission measurement with INTEGRAL/SPI as indirect probe of cosmic-ray electrons and positrons
• New very local interstellar spectra for electrons, positrons, protons and light cosmic ray nuclei
• Integral X-ray constraints on sub-GeV Dark Matter
• INTEGRAL/SPI ground calibration
• INTEGRAL/SPI $\gamma$-ray line spectroscopy
• The Galactic ${}^{26}$Al emission map as revealed by INTEGRAL/SPI
• Uncertainties in the Galactic dark matter distribution: an update
• Gamma-ray Emission of 60Fe and 26Al Radioactivities in our Galaxy
• Analytical Dynamical Models for Double-Power-Law Galactic Nuclei
• Constraints on light decaying dark matter candidates from 16 years of INTEGRAL/SPI observations
• The Compton Spectrometer and Imager
• Robust cosmic-ray constraints on $p$-wave annihilating MeV dark matter
• Addendum: Refined bounds on MeV-scale thermal dark sectors from BBN and the CMB
• Background modelling for $\gamma$-ray spectroscopy with INTEGRAL/SPI
• Diffuse Galactic emission spectrum between 0.5 and 8.0 MeV
• Reticulum II: Particle Dark Matter and Primordial Black Holes Limits
• Dark Matter prospects with COSI: ALPs, PBHs and sub-GeV Dark Matter
• Nucleosynthesis constraints through $\gamma$-ray line measurements from classical novae

Cited by in corpus (5)

• X-Ray Constraints on Dark Photon Tridents
• Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre
• Lepton collider as a window to reheating via freezing in dark matter detection. Part I
• Constraints on the parameters of keV-scale mass annihilating Dark Matter obtained with SRG/ART-XC observations
• Search for Axion-Like Particles from Nearby Pre-Supernova Stars