Generic description of CMB power spectra

Details Generic description of CMB power spectra Generic description of CMB power spectra

2003-09-19

arxiv.org/abs/astro-ph/0309526v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

Taking advantage of the smoothness of CMB Cl power spectra, we derive a simple and model-independent parameterization of their measurement. It allows to describe completely the spectrum, ie. provide an estimate of the value and the error for any real l point at the percent level, down to low l multipole. We provide this parameterization for WMAP first year data and show that the spectrum is consistent with the smoothness hypothesis. We also show how such a parameterization allows to retrieve the Cl spectra from the measurement of Fourier rings on the sky (Gamma(m)) or from the angular correlation function (c(theta))

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