Non-virialised clusters for detection of Dark Energy-Dark Matter interaction

Abstract

The observation of galaxy and gas distributions, as well as cosmological simulations in a $\Lambda$CDM Universe, suggests that clusters of galaxies are still accreting mass and are not expected to be in equilibrium. In this work, we investigate the possibility to evaluate the departure from virial equilibrium in order to detect, in that balance, effects from a Dark Matter--Dark Energy interaction. We continue, from previous works, using a simple model of interacting dark sector, the Layzer--Irvine equation for dynamical virial evolution, and employ optical observations in order to obtain the mass profiles through weak lensing and X-ray observations giving the intracluster gas temperatures. Through a Monte Carlo method, we generate, for a set of clusters, measurements of observed virial ratios, interaction strength, rest virial ratio and departure from equilibrium factors. We found a compounded interaction strength of $-1.99_{-16.00}^{+2.56}$, compatible with no interaction, but also a compounded rest virial ratio of $-0.79\pm 0.13$, which would entail a $2\sigma$ detection. We confirm quantitatively that clusters of galaxies are out of equilibrium but further investigation is needed to constrain a possible interaction in the dark sector.

12 pages

References in corpus (11)

• Cosmology and the Fate of Dilatation Symmetry
• Chandra temperature profiles for a sample of nearby relaxed galaxy clusters
• Dark Energy-Dark Matter Interaction and putative violation of the Equivalence Principle from the Abell Cluster A586
• Temperature profiles of a representative sample of nearby X-ray galaxy clusters
• Testing the Interaction between Dark Energy and Dark Matter with Planck Data
• Signature of the interaction between dark energy and dark matter in galaxy clusters
• Testing the interaction between dark energy and dark matter via latest observations
• Bandpass Dependence of X-ray Temperatures in Galaxy Clusters
• Dark Energy-Dark Matter Interaction from the Abell Cluster A586 and violation of the Equivalence Principle
• Hydrodynamical simulations of coupled and uncoupled quintessence models II: Galaxy clusters
• Dark Energy-Dark Matter Interaction from the Abell Cluster A586

Cited by in corpus (11)

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• New insights on the dissociative merging galaxy cluster Abell 2034
• Simulations of the merging galaxy cluster Abell 2034: what determines the level of separation between gas and dark matter
• On the change of old neutron star masses with galactocentric distance
• Instability in interacting dark sector: An appropriate Holographic Ricci dark energy model
• Neutron star mass in dark matter clumps
• New observational constraints on interacting dark energy using galaxy clusters virial equilibrium states
• Bounds from multi-messenger astronomy on the Super Heavy Dark Matter