Prospects of future MeV telescopes in probing weak-scale Dark Matter

Abstract

Galactic weak-scale Dark Matter (DM) particles annihilating into lepton-rich channels not only produce gamma-rays via prompt radiation but also generate abundant energetic electrons and positrons, which subsequently emit through bremsstrahlung or inverse Compton scattering (collectively called `secondary-radiation photons'). While the prompt gamma-rays concentrate at high-energy, the secondary emission falls in the MeV range, which a number of upcoming experiments (AMEGO, E-ASTROGAM, MAST...) will probe. We investigate the sensitivity of these future telescopes for weak-scale DM, focusing for definiteness on observations of the galactic center. We find that they have the potential of probing a wide region of the DM parameter space which is currently unconstrained. Namely, in rather optimistic configurations, future MeV telescopes could probe thermally-produced DM with a mass up to the TeV range, or GeV DM with an annihilation cross section 2 to 3 orders of magnitude smaller than the current bounds, precisely thanks to the significant leverage provided by their sensitivity to secondary emissions. We comment on astrophysical and methodological uncertainties, and compare with the reach of high-energy gamma ray experiments.

arXiv comment25 pages, 9 figures. v2: references added, prepared for SciPost submission. v3: 29 pages, 13 figures; added/extended discussions on propagation, systematic uncertainty, ISRF and gas profiles, statistical approaches; figures improved; Conclusions remain unchanged. v4: updated to the published version

References in corpus (72)

• The Structure of Cold Dark Matter Halos
• Propagation of cosmic-ray nucleons in the Galaxy
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium
• Diffuse Galactic continuum gamma rays. A model compatible with EGRET data and cosmic-ray measurements
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• Indirect Dark Matter Signatures in the Cosmic Dark Ages I. Generalizing the Bound on s-wave Dark Matter Annihilation from Planck
• Background model systematics for the Fermi GeV excess
• Fermi-LAT Observations of High-Energy Gamma-Ray Emission Toward the Galactic Center
• Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
• Limits to dark matter annihilation cross-section from a combined analysis of MAGIC and Fermi-LAT observations of dwarf satellite galaxies
• Global cosmic-ray related luminosity and energy budget of the Milky Way
• Science with e-ASTROGAM (A space mission for MeV-GeV gamma-ray astrophysics)
• Multi-frequency analysis of neutralino dark matter annihilations in the Coma cluster
• The e-ASTROGAM mission (exploring the extreme Universe with gamma rays in the MeV-GeV range)
• Monte Carlo design studies for the Cherenkov Telescope Array
• Stringent Constraint on Galactic Positron Production
• Diffuse gamma ray constraints on annihilating or decaying Dark Matter after Fermi
• Dark Matter Interpretations of the Electron/Positron Excesses after FERMI
• Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients
• Galactic secondary positron flux at the Earth
• GeV-Scale Thermal WIMPs: Not Even Slightly Dead
• Testing the Origin of High-Energy Cosmic Rays
• The Case for a 700+ GeV WIMP: Cosmic Ray Spectra from PAMELA, Fermi and ATIC
• On the estimation of the Local Dark Matter Density using the rotation curve of the Milky Way
• Detecting dark matter WIMPs in the Draco dwarf: a multi-wavelength perspective
• Direct Detection of Hawking Radiation from Asteroid-Mass Primordial Black Holes
• Inverse Compton constraints on the Dark Matter e+e- excesses
• Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
• Search for dark matter annihilation signals in the H.E.S.S. Inner Galaxy Survey
• Indirect Detection of Dark Matter Using MeV-Range Gamma-Ray Telescopes
• The All-sky Medium Energy Gamma-ray Observatory eXplorer (AMEGO-X) Mission Concept
• Constraints on dark matter annihilation from CMB observations before Planck
• Multimessenger constraints on the dark matter interpretation of the Fermi-LAT Galactic center excess
• Discriminating different scenarios to account for the cosmic $e^{\pm }$ excess by synchrotron and inverse Compton radiation
• Integral X-ray constraints on sub-GeV Dark Matter
• Cosmic-ray propagation with DRAGON2: II. Nuclear interactions with the interstellar gas
• A Pair Production Telescope for Medium-Energy Gamma-Ray Polarimetry
• Diffuse inverse Compton and synchrotron emission from dark matter annihilations in galactic satellites
• Results from the search for dark matter in the Milky Way with 9 years of data of the ANTARES neutrino telescope
• Dark matter and pulsar signals for Fermi LAT, PAMELA, ATIC, HESS and WMAP data
• Prospects for indirect dark matter searches with MeV photons
• Prospects for Annihilating Dark Matter in the inner Galactic halo by the Cherenkov Telescope Array
• AMEGO: Exploring the Extreme Multimessenger Universe
• PANGU: A High Resolution Gamma-ray Space Telescope
• Secondary radiation from the Pamela/ATIC excess and relevance for Fermi
• Bremsstrahlung gamma rays from light Dark Matter
• Searching for Dark Matter in the Galactic Halo with a Wide Field of View TeV Gamma-ray Observatory in the Southern Hemisphere
• The cosmic X-ray and gamma-ray background from dark matter annihilation
• Massive Argon Space Telescope (MAST): a concept of heavy time projection chamber for gamma-ray astronomy in the 100 MeV --- 1 TeV energy range
• A new estimate of the Galactic interstellar radiation field between 0.1 microns and 1000 microns
• A Multi-frequency analysis of dark matter annihilation interpretations of recent anti-particle and gamma-ray excesses in cosmic structures
• Dark Matter prospects with COSI: ALPs, PBHs and sub-GeV Dark Matter
• Precision Gamma-Ray Constraints for Sub-GeV Dark Matter Models
• Hunting for Dark Matter and New Physics with GECCO
• Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array
• A Fresh Approach to Forecasting in Astroparticle Physics and Dark Matter Searches
• Interstellar gamma rays and cosmic rays: new insights from Fermi-LAT AND INTEGRAL
• Constraints on dark matter with future MeV gamma-ray telescopes
• Dark Matter Identification with Gamma Rays from Dwarf Galaxies
• Unveiling the Fermi Bubbles origin with MeV photon telescopes
• MeV to multi-TeV thermal WIMPs: most conservative limits
• Dark Matter
• AMS-02 antiprotons and dark matter: Trimmed hints and robust bounds
• Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)
• Putting all the X in one basket: Updated X-ray constraints on sub-GeV Dark Matter
• Combined dark matter searches towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS
• Limits on primordial black holes detectability with Isatis: A BlackHawk tool
• MHz to TeV expectations from scotogenic WIMP dark matter
• Reviving MeV-GeV Indirect Detection with Inelastic Dark Matter
• Importance of cosmic ray propagation on sub-GeV dark matter constraints

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• Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X