Testing the origin of ~3.55 keV line in individual galaxy clusters observed with XMM-Newton

Abstract

If the unidentified emission line at ~3.55 keV previously found in spectra of nearby galaxies and galaxy clusters is due to radiatively decaying dark matter, one should detect the signal of comparable strength from many cosmic objects of different nature. By studying existing dark matter distributions in galaxy clusters we identified top-19 of them observed by XMM-Newton X-ray cosmic mission, and analyzed the data for the presence of the new line. In 8 of them, we identified > 2 sigma positive line-like residuals with average position 3.52 +/- 0.08 keV in the emitter's frame. Their observed properties are unlikely to be explained by statistical fluctuations or astrophysical emission lines; observed line position in M31 and Galactic Center makes an additional argument against general-type systematics. Being interpreted as decaying dark matter line, the new detections correspond to radiative decay lifetime tau_dm ~ (3.5-6) x 10^27 s consistent with previous detections.

8 pages, 4 figures. Comments are welcome

Cited by in corpus (25)

• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• A White Paper on keV Sterile Neutrino Dark Matter
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• Dark matters on the scale of galaxies
• NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact
• Searching for decaying dark matter in deep XMM-Newton observation of the Draco dwarf spheroidal
• Satellite galaxies in semi-analytic models of galaxy formation with sterile neutrino dark matter
• A novel scenario for the possible X-ray line feature at ~3.5 keV: Charge exchange with bare sulfur ions
• Resonant Sterile Neutrino Dark Matter in the Local and High-z Universe
• Decaying dark matter search with NuSTAR deep sky observations
• Properties of Resonantly Produced Sterile Neutrino Dark Matter Subhalos
• Properties of Local Group galaxies in hydrodynamical simulations of sterile neutrino dark matter cosmologies
• Dodelson-Widrow Production of Sterile Neutrino Dark Matter with Non-Trivial Initial Abundance
• Toward the full test of the nuMSM sterile neutrino dark matter model with Athena
• Cold light dark matter in extended seesaw models
• Dark photon relic dark matter production through the dark axion portal
• Searching for the 3.5 keV Line in the Stacked Suzaku Observations of Galaxy Clusters
• The role of the eROSITA all-sky survey in searches for sterile neutrino dark matter
• 21-cm observations and warm dark matter models
• Spherical Cows in Dark Matter Indirect Detection
• The Doppler effect on indirect detection of dark matter using dark matter only simulations
• Influence of ~7 keV sterile neutrino dark matter on the process of reionization
• The 3.5 keV Line from Stringy Axions
• 3.55 keV Silicon Anomaly as X-ray Candle in the Universe
• Boosting (In)direct Detection of Dark Matter