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Title:
Correlations between the Wilkinson Microwave Anisotropy Probe and MAXIMA Cosmic Microwave Background Anisotropy Maps
Authors:
Abroe, M. E.; Borrill, J.; Ferreira, P. G.; Hanany, S.; Jaffe, A.; Johnson, B.; Lee, A. T.; Rabii, B.; Richards, P. L.; Smoot, G.; Stompor, R.; Winant, C.; Wu, J. H. P.
Affiliation:
AA(School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455; .), AB(Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Space Sciences Laboratory, University of California, Berkeley, CA 94720.), AC(Astrophysics, University of Oxford, Oxford OX1 3RH, UK.), AD(School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455; .), AE(Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2BW, UK), AF(School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455; .), AG(Department of Physics, University of California, Berkeley, CA 94720.; Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AH(Space Sciences Laboratory, University of California, Berkeley, CA 94720.; Department of Physics, University of California, Berkeley, CA 94720.), AI(Department of Physics, University of California, Berkeley, CA 94720.), AJ(Department of Physics, University of California, Berkeley, CA 94720.; Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AK(Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.; Space Sciences Laboratory, University of California, Berkeley, CA 94720.), AL(Department of Physics, University of California, Berkeley, CA 94720.), AM(Department of Physics, National Taiwan University, Taipei 106, Taiwan.)
Publication:
The Astrophysical Journal, Volume 605, Issue 2, pp. 607-613. (ApJ Homepage)
Publication Date:
04/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmic Microwave Background, Methods: Data Analysis, Methods: Statistical
DOI:
10.1086/382348
Bibliographic Code:
2004ApJ...605..607A

Abstract

We cross-correlate the cosmic microwave background (CMB) temperature anisotropy maps from the Wilkinson Microwave Anisotropy Probe (WMAP), MAXIMA-1, and MAXIMA-2 experiments. We use the cross spectrum, which is the spherical harmonic transform of the angular two-point correlation function, to quantify the correlation as a function of angular scale. We find that the three possible pairs of cross spectra are in close agreement with each other and with the power spectra of the individual maps. The probability that there is no correlation between the maps is smaller than 1×10-8. We also calculate power spectra for maps made of differences between pairs of maps and show that they are consistent with no signal. The results conclusively show that the three experiments not only display the same statistical properties of the CMB anisotropy, but also detect the same features wherever the observed sky areas overlap. We conclude that the contribution of systematic errors to these maps is negligible and that MAXIMA and WMAP have accurately mapped the CMB anisotropy.
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