Microwave background anisotropies and non-linear structures II. Numerical computations

Details Microwave background anisotropies and non-linear structures II. Numerical computations Microwave background anisotropies and non-linear structures II. Numerical computations

1998-10-09

arxiv.org/abs/astro-ph/9810149v1

Astronomy and Astrophysics

Astrophysics

15 pages, 23 figures; Monthly Notices of the Royal Astronomical Society (MNRAS), in press

Scientific paper

10.1046/j.1365-8711.1999.02164.x

A new method for modelling spherically symmetric inhomogeneities is applied to the formation of clusters in an expanding Universe. We impose simple initial velocity and density perturbations of finite extent and we investigate the subsequent evolution of the density field. Photon paths are also calculated, allowing a detailed consideration of gravitational lensing effects and microwave background anisotropies induced by the cluster. We apply the method to modelling high-redshift clusters and, in particular, we consider the reported microwave decrement observed towards the quasar pair PC1643+4631 A&B. We also consider the effect on the primordial microwave background power spectrum due to gravitational lensing by a population of massive high-redshift clusters.

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