RMS Anisotropy in the COBE-DMR Four-Year Sky Maps

Details RMS Anisotropy in the COBE-DMR Four-Year Sky Maps RMS Anisotropy in the COBE-DMR Four-Year Sky Maps

1996-01-12

arxiv.org/abs/astro-ph/9601065v1

Astrophys.J.475:393-398,1997

Astronomy and Astrophysics

Astrophysics

14 pages, submitted to The Astrophysical Journal (Letters)

Scientific paper

10.1086/303585

The sky-RMS is the simplest model-independent characterization of a cosmological anisotropy signal. The RMS temperature fluctuations determined from the $COBE$-DMR four-year sky maps are frequency independent, consistent with the hypothesis that they are cosmological in origin, with a typical amplitude at 7 degrees of ~ 35 \pm\ 2 uK and at 10 degrees of ~29 \pm\ 1 uK. A joint analysis of the 7 deg and 10 deg "cross"-RMS derived from the data in both Galactic and Ecliptic coordinates is used to determine the RMS quadrupole normalization, $Q_{rms-PS}$, for a scale-invariant Harrison-Zel'dovich power law model. The difference in the inferred normalizations either including or excluding the quadrupole is a consequence of the sensitivity of the method to the Galaxy contaminated observed sky quadrupole. Whilst there are variations depending on the data selection, all results are consistent with an inferred \qrms\ normalization of ~18 \pm\ 2 uK.

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