The Four-Year COBE Normalization and Large-Scale Structure

Details The Four-Year COBE Normalization and Large-Scale Structure The Four-Year COBE Normalization and Large-Scale Structure

1996-07-12

arxiv.org/abs/astro-ph/9607060v2

Astrophys.J.480:6-21,1997

Astronomy and Astrophysics

Astrophysics

LaTeX, 22 pages. Uses aaspp4.sty. 18 PostScript figures included. Final version, accepted to the Astrophysical Journal. Numero

Scientific paper

10.1086/303955

We present an analysis of the four-year data from the COBE DMR experiment. We use a Karhunen-Loeve expansion of the pixel data to calculate the normalization and goodness-of-fit of a range of models of structure formation. This technique produces unbiased normalization estimates and is capable of determining the normalization of any particular model with a statistical uncertainty of 7%. We present a parameterization of the normalization and likelihood function which summarizes our results for a wide range of models. We use the COBE normalization to compute small-scale fluctuation amplitudes for a variety of models and discuss the implications of these results for theories of large-scale structure.

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