An unidentified line in X-ray spectra of the Andromeda galaxy and Perseus galaxy cluster

Abstract

We report a weak line at 3.52+/-0.02 keV in X-ray spectra of M31 galaxy and the Perseus galaxy cluster observed by MOS and PN cameras of XMM-Newton telescope. This line is not known as an atomic line in the spectra of galaxies or clusters. It becomes stronger towards the centers of the objects; is stronger for Perseus than for M31; is absent in the spectrum of a deep "blank sky'' dataset. Although for each object it is hard to exclude that the feature is due to an instrumental effect or an atomic line, it is consistent with the behavior of a dark matter decay line. Future (non-)detections of this line in multiple objects may help to reveal its nature.

11 pages, 8 figures

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• Correlation Analysis of Decaying Sterile Neutrino Dark Matter in the Context of the SRG Mission
• A see-saw scenario of an $A_4$ flavour symmetric standard model
• Phasing out of Darkness: From Sterile Neutrino Dark Matter to Neutrino Masses via Time-Dependent Mixing
• Return of the Lepton Number: Sterile Neutrino Dark Matter Production and the Revival of the Shi-Fuller Mechanism
• Unlocking Discovery Potential for Decaying Dark Matter and Faint X-ray Sources with XRISM
• Possible modification to standard cosmological model to resolve tension with Hubble constant values
• New emission line at ~3.5 keV - observational status, connection with radiatively decaying dark matter and directions for future studies
• Can decaying sterile neutrinos account for all dark matter?
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Neutrino phenomenology and keV dark matter in 2HDM with $A_4$ symmetry
• 7 keV sterile neutrino Dark Matter in extended seesaw framework
• The decaying and scattering properties of the $d^{\ast }$(2380) hexaquark Bose Einstein Condensate dark matter
• Production of GeV-scale heavy neutral leptons in 3-body decays. Comparison with the PYTHIA approach
• KeV scale new fermion from a hidden sector
• Self-interacting dark matter as a solution to the problems in small-scale structures
• Warm dark matter sterile neutrinos in electron capture and beta decay spectra
• Composite dark matter and direct-search experiments
• Sterile neutrino rates for general $M$, $T$, $\mu$, $k$: review of a theoretical framework
• Observing the very low-surface brightness dwarfs in a deep field in the VIRGO cluster: constraints on Dark Matter scenarios
• Signatures of Dark Matter in Cosmic-Ray Observations
• Neutrinos in Astrophysics and Cosmology: Theoretical Advanced Study Institute (TASI) 2020 Lectures
• Exploring Ultralight Scalar Assistance in Sterile Neutrino Dark Matter: Cold Spectrum and Unusual X/Gamma-ray Signatures
• Detecting Fluorescent Dark Matter with X-ray lasers
• Cosmic Structure Strikes Back: The Elimination of Vector-Mediated Nonstandard Interaction Models as a Mechanism for Sterile Neutrino Dark Matter Production
• Theoretical Results on Neutrinos
• Note on Thermalization of Non-resonantly Produced Sterile Neutrinos
• Searching for Particle Dark Matter with eROSITA Early Data
• Subdominant Dark Matter sterile neutrino resonant production in the light of Planck
• Circular polarisation: a new probe of dark matter and neutrinos in the sky
• Photonic dark matter portal revisited
• Structure Formation Limits on Axion-Like Dark Matter
• Searches for 3.5 keV Absorption Features in Cluster AGN Spectra
• Blois 2019: highlights and outlook
• Theoretical and phenomenological consequences of active and sterile neutrino within Beyond Standard Model framework
• Hints of a PeV Scale Supersymmetric Neutrino Sector: Neutrino Masses, Dark Matter, keV and PeV Anomalies
• Opening up New Parameter Space for Sterile Neutrino Dark Matter
• Galaxy-galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes
• Status and Perspectives of Neutrino Physics
• Photonic dark matter portal and quantum physics
• Lα line of dark positronium as nongravitational detection of dark matter
• Signatures of relic quantum nonequilibrium
• Sterile neutrino dark matter from a TeV Scale Seesaw
• Search for Dark Matter Annihilation and Decay with H$\alpha$ Line Emission
• How many new particles do we need after the Higgs boson?
• Cosmological constraints on sterile neutrino Dark Matter production mechanisms
• High-resolution X-ray spectroscopy of clusters of galaxies
• Sterile neutrino dark matter production in presence of non-standard neutrino self-interactions: an EFT approach
• Potential solar axion signatures in X-ray observations with the XMM-Newton observatory
• Studying Both the Universe and Neutrinos Themselves Using Cosmic and Astrophysical Neutrinos
• Main properties of new heavy hadrons and the luminosity of hadronic dark matter
• New Physics at the TeV Scale
• Freeze-in Dark Matter via Lepton Portal: Hubble Tension and Stellar Cooling
• Intermediate Scale Accidental Axion and ALPs
• Sterile Neutrinos in $E_6$