Asymmetric beams in cosmic microwave background anisotropy experiments

J. H.P. Wu, A. Balbi, J. Borrill, P. G. Ferreira, S. Hanany, A. H. Jaffe, A. T. Lee, S. Oh, B. Rabii, P. L. Richards, G. F. Smoot, R. Stompor, C. D. Winant

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


We propose a new formalism to handle asymmetric beams in the data analysis of cosmic microwave background anisotropy experiments. For any beam shape, the formalism finds the optimal circularly symmetric equivalent and is thus easily adaptable to existing data analysis methods. We demonstrate certain key points by using a simulated highly elliptic beam and the beams and data of the MAXIMA-1 experiment, where the asymmetry is mild. We show that in both cases the formalism does not bias the angular power spectrum estimates. We analyze the limitations of the formalism and find that it is well suited for most practical situations.

Original languageEnglish (US)
Pages (from-to)1-17
Number of pages17
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Jan 2001


  • Cosmic microwave background
  • Cosmology : theory
  • Large-scale structure of universe
  • Methods: data analysis
  • Methods: numerical


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