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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• keV-Scale Sterile Neutrino Sensitivity Estimation with Time-Of-Flight Spectroscopy in KATRIN using Self-Consistent Approximate Monte Carlo
• Freeze-in and freeze-out of sterile neutrino dark matter
• Axion production from primordial magnetic fields
• Dark Matter Macroscopic Pearls, 3.55 keV X-ray line, How big ?
• 3.5 keV X-ray Line Signal from Dark Matter Decay in Local $U(1{)}_{B-L}$ Extension of Zee-Babu Model
• Freeze-In Dark Matter within the Seesaw mechanism
• Understanding Dwarf Galaxies in order to Understand Dark Matter
• Non-Minimal Approximation for the Type-I Seesaw Mechanism
• Supersymmetric Higgs-portal and X-ray lines
• Testing the axion-conversion hypothesis of 3.5 keV emission with polarization
• Neutrino masses in the minimal gauged $(B-L)$ supersymmetry
• Correlation Analysis of Decaying Sterile Neutrino Dark Matter in the Context of the SRG Mission
• Globular clusters vs dark matter haloes in strong lensing observations
• Thermal keV dark matter in a gauged B-L model with cosmic inflation
• Simulating the dark matter decay signal from the Perseus galaxy cluster
• Dirac neutrino mass from a neutrino dark matter model for the galaxy cluster Abell 1689
• Neutrino Mass, Coupling Unification, Verifiable Proton Decay, Vacuum Stability and WIMP Dark Matter in SU(5)
• Dwarf Galaxy $\gamma$-excess and 3.55 keV X-ray Line In A Nonthermal Dark Matter Model
• The viability of the 3+1 neutrino model in the supernova neutrino process
• 7 keV sterile neutrino Dark Matter in extended seesaw framework
• Possible modification to standard cosmological model to resolve tension with Hubble constant values
• Unlocking Discovery Potential for Decaying Dark Matter and Faint X-ray Sources with XRISM
• Phasing out of Darkness: From Sterile Neutrino Dark Matter to Neutrino Masses via Time-Dependent Mixing
• New emission line at ~3.5 keV - observational status, connection with radiatively decaying dark matter and directions for future studies
• Return of the Lepton Number: Sterile Neutrino Dark Matter Production and the Revival of the Shi-Fuller Mechanism
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Can decaying sterile neutrinos account for all dark matter?
• Neutrino phenomenology and keV dark matter in 2HDM with $A_4$ symmetry
• A see-saw scenario of an $A_4$ flavour symmetric standard model
• Self-interacting dark matter as a solution to the problems in small-scale structures
• The decaying and scattering properties of the $d^{\ast }$(2380) hexaquark Bose Einstein Condensate dark matter
• Neutrinos in Astrophysics and Cosmology: Theoretical Advanced Study Institute (TASI) 2020 Lectures
• Composite dark matter and direct-search experiments
• Production of GeV-scale heavy neutral leptons in 3-body decays. Comparison with the PYTHIA approach
• Signatures of Dark Matter in Cosmic-Ray Observations
• KeV scale new fermion from a hidden sector
• Sterile neutrino rates for general $M$, $T$, $\mu$, $k$: review of a theoretical framework
• Warm dark matter sterile neutrinos in electron capture and beta decay spectra
• Observing the very low-surface brightness dwarfs in a deep field in the VIRGO cluster: constraints on Dark Matter scenarios
• Note on Thermalization of Non-resonantly Produced Sterile Neutrinos
• Cosmic Structure Strikes Back: The Elimination of Vector-Mediated Nonstandard Interaction Models as a Mechanism for Sterile Neutrino Dark Matter Production
• Subdominant Dark Matter sterile neutrino resonant production in the light of Planck
• Theoretical Results on Neutrinos
• Circular polarisation: a new probe of dark matter and neutrinos in the sky
• Detecting Fluorescent Dark Matter with X-ray lasers
• Photonic dark matter portal revisited
• Exploring Ultralight Scalar Assistance in Sterile Neutrino Dark Matter: Cold Spectrum and Unusual X/Gamma-ray Signatures
• Searching for Particle Dark Matter with eROSITA Early Data
• Structure Formation Limits on Axion-Like Dark Matter
• Theoretical and phenomenological consequences of active and sterile neutrino within Beyond Standard Model framework
• Searches for 3.5 keV Absorption Features in Cluster AGN Spectra
• Galaxy-galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes
• Blois 2019: highlights and outlook
• Photonic dark matter portal and quantum physics
• Opening up New Parameter Space for Sterile Neutrino Dark Matter
• Lα line of dark positronium as nongravitational detection of dark matter
• Hints of a PeV Scale Supersymmetric Neutrino Sector: Neutrino Masses, Dark Matter, keV and PeV Anomalies
• Signatures of relic quantum nonequilibrium
• Status and Perspectives of Neutrino Physics
• High-resolution X-ray spectroscopy of clusters of galaxies
• Freeze-in Dark Matter via Lepton Portal: Hubble Tension and Stellar Cooling
• Studying Both the Universe and Neutrinos Themselves Using Cosmic and Astrophysical Neutrinos
• Search for Dark Matter Annihilation and Decay with H$\alpha$ Line Emission
• Potential solar axion signatures in X-ray observations with the XMM-Newton observatory
• Sterile Neutrinos in $E_6$
• How many new particles do we need after the Higgs boson?
• Intermediate Scale Accidental Axion and ALPs
• Cosmological constraints on sterile neutrino Dark Matter production mechanisms
• Sterile neutrino dark matter from a TeV Scale Seesaw
• Main properties of new heavy hadrons and the luminosity of hadronic dark matter
• New Physics at the TeV Scale
• Study of piN->pipiN processes on polarized targets: Quantum environment and its dephasing interaction with particle scattering
• Sterile neutrino dark matter production in presence of non-standard neutrino self-interactions: an EFT approach