Probing the nature of dark matter with Cosmic X-rays: Constraints from "Dark blobs" and grating spectra of galaxy clusters

Abstract

Gravitational lensing observations of galaxy clusters have identified dark matter ``blobs'' with remarkably low baryonic content. We use such a system to probe the particle nature of dark matter with X-ray observations. We also study high resolution X-ray grating spectra of a cluster of galaxies. From these grating spectra we improve the conservative constraints on a particular dark matter candidate, the sterile neutrino, by more than one order of magnitude. Based on these conservative constraints obtained from Cosmic X-ray observations alone, the low mass (m_s < 10keV) and low mixing angle (sin^2(2θ) 10^{-6}) sterile neutrino is still a viable dark matter candidate.

4 pages, 4 figures

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• Can sterile neutrinos be ruled out as warm dark matter candidates?
• Where to find a dark matter sterile neutrino?
• Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter
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• How to find neutral leptons of the nuMSM?
• Dark-matter sterile neutrinos in models with a gauge singlet in the Higgs sector
• Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry
• Constraints on the Dark Matter Particle Mass from the Number of Milky Way Satellites
• Constraints on dark matter particles from theory, galaxy observations and N-body simulations
• Strong Upper Limits on Sterile Neutrino Warm Dark Matter
• Small-scale structure formation properties of chilled sterile neutrinos as dark matter
• Sterile neutrinos as subdominant warm dark matter
• X-ray photons from late-decaying majoron dark matter
• Delayed pulsar kicks from the emission of sterile neutrinos
• Production of a sterile species via active-sterile mixing: an exactly solvable model
• Searching for decaying axion-like dark matter from clusters of galaxies
• Unsterile-Active Neutrino Mixing: Consequences on Radiative Decay and Bounds from the X-ray Background
• Phasing out of Darkness: From Sterile Neutrino Dark Matter to Neutrino Masses via Time-Dependent Mixing
• How many new particles do we need after the Higgs boson?