1997/12/31 by Max Tegmark · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #COSMIC cancer database #Computer science #Contrast (vision) #Cosmic microwave background #Galaxies: Formation, Evolution, Phenomena #Geography #Index (typography) #Microwave #Optics #Physics #Planck #Position (finance) #Radio Astronomy Observations and Technology #Radio spectrum #Remote sensing #Satellite #Spectral index #Spectral line #astro-ph
paper · pdf · doi:10.1086/305905
published as ApJ, 502, 1-6 (1998) · Expanded with wavelet discussion. Matches accepted ApJ version. 6 pages, with 3 figs included. Color figures and links at http://www.sns.ias.edu/~max/foregrounds.html (faster from the US), from http://www.mpa-garching.mpg.de/~max/foregrounds.html (faster from Europe) or from [email protected]
arxiv created 1998/02/20 · openalex publication_date 1998/07/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Most work on foreground removal has treated the case where the frequency dependence of all components is perfectly known and independent of position. In contrast, real-world foregrounds are generally not perfectly correlated between frequencies, with the spectral index varying slightly with position and (in the case of some radio sources) with time. A method incorporating this complication is presented and illustrated with an application to the upcoming satellite missions MAP and Planck . We find that even spectral index variations as small as Δα ~ 0.1 can have a substantial impact on how channels should be combined and on attainable accuracy.