The remarkable improvement in the estimates of different cosmological parameters in recent years has been largely spearheaded by accurate measurements of the angular power spectrum of Cosmic Microwave Background (CMB) radiation. This has required removal of foreground contamination as well as detector noise bias with reliability and precision. Recently, a novel model-independent method for the ...

It is now well known that mode-coupling effects associated with certain secondary effects generate higher order correlations in cosmic microwave background ~CMB! temperature anisotropies, beyond the two-point function. In order to extract such a non-Gaussian signal at the three-point level, we suggest a two-point statistic in the form of an angular power spectrum involving correlations between ...

We use hydrodynamical simulations to assess the impact of radiative cooling and ‘pre-heating’ on predictions for the Sunyaev–Zel’dovich (SZ) effect. We find that cooling significantly reduces both the mean SZ signal and its angular power spectrum. Pre-heating can give a higher mean distortion, while leaving the angular power spectrum below that found in a simulation without heating or cooling. ...

We use hydrodynamical simulations to assess the impact of radiative cooling and “preheating” on predictions for the Sunyaev-Zeldovich (SZ) effect. Cooling significantly reduces both the mean SZ signal and its angular power spectrum, while preheating can increase the mean distortion while leaving the angular power spectrum below that found in a simulation without heating or cooling. We study the...

The APM Galaxy Survey maps the angular positions of more than one million galaxies to bJ = 20, covering a volume comparable to the forthcoming Sloan Digital Sky Survey. A numerical algorithm has been developed to estimate the power spectrum in three dimensions, using the angular clustering and a model for the redshift distribution of APM Galaxies. The power spectrum obtained is free from distor...

We have developed a fast method for predicting the angular power spectrum, Cl, of the cosmic microwave background given cosmological parameters and a primordial power spectrum of perturbations. After pre–computing the radiation temperature and gravitational potential transfer functions over a small sub–space of the total model parameter space, the rest of the model space (six or more cosmologic...