Four-Year COBE DMR Cosmic Microwave Background Observations: Maps and Basic Results

@article{Bennett1996FourYearCD,
  title={Four-Year COBE DMR Cosmic Microwave Background Observations: Maps and Basic Results},
  author={Charles L. Bennett and Anthony J. Banday and K. M. G{\'o}rski and Gary F. Hinshaw and Peter Douglas Jackson and Phillip B. Keegstra and Alan Kogut and George F. Smoot and David Todd Wilkinson and Edward L. Wright},
  journal={The Astrophysical Journal Letters},
  year={1996},
  volume={464},
  pages={L1 - L4}
}
In this Letter we present a summary of the spatial properties of the cosmic microwave background radiation based on the full 4 yr of COBE Differential Microwave Radiometer (DMR) observations, with additional details in a set of companion Letters. The anisotropy is consistent with a scale-invariant power-law model and Gaussian statistics. With full use of the multifrequency 4 yr DMR data, including our estimate of the effects of Galactic emission, we find a power-law spectral index of n = 1.2… 

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