Search for non-Gaussianities in the WMAP data with the Scaling Index Method
| Autor: | Gregor E. Morfill, H. Modest, C. Raeth, A. J. Banday, K. M. Górski, G. Rossmanith |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) lcsh:Astronomy media_common.quotation_subject Cosmic microwave background FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Measure (mathematics) CMB cold spot Data set lcsh:QB1-991 Space and Planetary Science Sky Satellite Focus (optics) Algorithm Scaling media_common Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Advances in Astronomy, Vol 2011 (2011) |
| Popis: | In the recent years, non-Gaussianity and statistical isotropy of the Cosmic Microwave Background (CMB) was investigated with various statistical measures, first and foremost by means of the measurements of the WMAP satellite. In this Review, we focus on the analyses that were accomplished with a measure of local type, the so-called Scaling Index Method (SIM). The SIM is able to detect structural characteristics of a given data set, and has proven to be highly valuable in CMB analysis. It was used for comparing the data set with simulations as well as surrogates, which are full sky maps generated by randomisation of previously selected features of the original map. During these investigations, strong evidence for non-Gaussianities as well as asymmetries and local features could be detected. In combination with the surrogates approach, the SIM detected the highest significances for non-Gaussianity to date. 19 pages, 15 figures, Review Article, Accepted for publication in Advances in Astronomy |
| Databáze: | OpenAIRE |
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