1997/10/30 by J. Delabrouille, K. M. Górski, E. Hivon · 2 citations
Physics and Astronomy · #Algorithm #Anisotropy #Astronomy #Astrophysics #Computation #Computer science #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Fourier analysis #Fourier transform #Microwave #Noise (video) #Optics #Physics #Radio Astronomy Observations and Technology #Scientific Research and Discoveries #Sky #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.1998.01646.x
10 pages, 5 figures (.ps), submitted to MNRAS
arxiv created 1997/10/30 · openalex publication_date 1998/08/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A number of experiments for measuring anisotropies of the cosmic microwave background (CMB) use scanning strategies in which temperature fluctuations are measured along circular scans on the sky. It is possible, from a large number of such intersecting circular scans, to build two-dimensional sky maps for subsequent analysis. However, since instrumental effects — especially the excess low-frequency 1/f noise — project on to such two-dimensional maps in a non-trivial way, we discuss the analysis approach which focuses on information contained in the individual circular scans. This natural way of looking at CMB data from experiments scanning on the circles combines the advantages of elegant simplicity of Fourier series for the computation of statistics useful for constraining cosmological scenarios, and superior efficiency in analysing and quantifying most of the crucial instrumental effects.