The roughness of the last scattering surface

Details The roughness of the last scattering surface The roughness of the last scattering surface

1999-06-22

arxiv.org/abs/astro-ph/9906345v1

Astronomy and Astrophysics

Astrophysics

17 pages, 4 figures (1 in colour), LaTeX, uses aaspp4.sty, ApJ, in press, November 1, 1999 issue, Vol. 525 #1

Scientific paper

10.1086/307874

We propose an alternative analysis of the microwave background temperature anisotropy maps that is based on the study of the roughness of natural surfaces. We apply it to large angle anisotropies, such as those measured by COBE-DMR. We show that for a large signal to noise experiment, the spectral index can be determined independently of the normalization. We then analyze the 4 yr COBE map and find for a flat $\Omega=1$ universe, that the best-fitting value for the spectral index is $n = 1.15^{+0.39}_{-0.34}$ and for the amplitude $Q_{rms-PS}= 14.1^{+3.9}_{-3.5}\mu K$. For $n=1$, the best-fitting normalization is $Q_{rms-PS}|_{n=1}= 16.2^{+1.4}_{-1.3}\mu K$.

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