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A&A 419, 439-447 (2004)
DOI: 10.1051/0004-6361:20035587
Measuring dark matter flows in merging clusters of galaxies
J. A. Rubiño-Martín, C. Hernández-Monteagudo and T. A. EnßlinMax-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str.1, Postfach 1317, 85741 Garching, Germany
(Received 28 October 2003 / Accepted 11 February 2004)
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 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, to achieve a 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.
Key words: galaxies: intergalactic medium -- galaxies: clusters: general -- galaxies: interactions -- gravitational lensing -- cosmology: cosmic microwave background
Offprint request: J. A. Rubiño-Martín, jalberto@mpa-garching.mpg.de
© ESO 2004
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