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The two-point temperature correlation function, C(&theta), is estimated for the sky by computing the average product of all map temperatures with a fixed angular separation &theta. The temperature correlation function presented here is computed from the WMAP Internal Linear Combination (ILC) map degraded to approximately 0.5^° pixels (HEALPix Nside=128). Pixels within the Kp0 intensity mask have been excluded from the computation as a further step to reduce foreground contamination. The data file is in ASCII format, with two columns: &theta, in degrees, and C(&theta), in mK². As noted in Bennett et al. (2003), the WMAP temperature correlation function exhibits very little large scale CMB anisotropy power, confirming the findings of COBE/DMR (e.g., Hinshaw et al. 1996).

More details can be found in:

"First Year Wilkinson Microwave Anisotropy Probe (WMAP) Results:
Basic Results", Bennett, et al., 2003

"Two-Point Correlations in the COBE DMR Four-Year Anisotropy Maps", Hinshaw et al., 1996

WMAP Explanatory Supplement

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