Measuring Dark Matter Flows in Merging Clusters of Galaxies

Abstract

The Rees-Sciama effect produced in mergers of galaxy clusters is discussed, and an analytical approximation to compute this effect from numerical simulations is given. Using this approximation and a novel toy model describing the physics of the merger, we characterize the spatial properties and symmetries of the Rees-Sciama signal. Based on these properties, we propose a method to extract the physical parameters of the merger, which relies on the computation of the quadrupole moment of the observed brightness distribution on the sky. The relationships between the quadrupole coefficients and the physical parameters of the merger (physical separation, projection angle on the sky and angular momentum) are discussed. Finally, we propose a method to co-add coherently the RS signals from a sample of cluster mergers, in order to achieve an statistical detection of the effect for those cases where individual signals are masked by the kinetic SZ effect, the primordial CMB components, and by observational noise.

arXiv comment10 pages, 11 figures. Accepted for publication in Astronomy and Astrophysics

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Cited by in corpus (9)

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• Dark energy imprints on the kinematic Sunyaev-Zel'dovich signal
• Weak lensing in the second post-Newtonian approximation: Gravitomagnetic potentials and the integrated Sachs-Wolfe effect
• Pairwise Transverse Velocity Measurement with the Rees-Sciama Effect
• Tangential Velocity of the Dark Matter in the Bullet Cluster from Precise Lensed Image Redshifts
• Simulating the galaxy cluster "El Gordo": gas motion, kinetic Sunyaev-Zel'dovich signal, and X-ray line features
• The Moving Lens Effect: Simulations, Forecasts and Foreground Mitigation