A 3.55 keV line from $\text{DM}\to a\to \gamma$: predictions for cool-core and non-cool-core clusters

Abstract

We further study a scenario in which a 3.55 keV X-ray line arises from decay of dark matter to an axion-like particle (ALP), that subsequently converts to a photon in astrophysical magnetic fields. We perform numerical simulations of Gaussian random magnetic fields with radial scaling of the magnetic field magnitude with the electron density, for both cool-core `Perseus' and non-cool-core `Coma' electron density profiles. Using these, we quantitatively study the resulting signal strength and morphology for cool-core and non-cool-core clusters. Our study includes the effects of fields of view that cover only the central part of the cluster, the effects of offset pointings on the radial decline of signal strength and the effects of dividing clusters into annuli. We find good agreement with current data and make predictions for future analyses and observations.

14 pages, 6 figures

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• Hidden axion dark matter decaying through mixing with QCD axion and the 3.5 keV X-ray line
• X-ray Line from the Dark Transition Electric Dipole
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• Observational consistency and future predictions for a 3.5 keV ALP to photon line
• Anticipating the XRISM search for the decay of resonantly produced sterile neutrino dark matter
• Testing the axion-conversion hypothesis of 3.5 keV emission with polarization