Improved Constraints on Cosmology and Foregrounds from BICEP2 and Keck Array Cosmic Microwave Background Data with Inclusion of 95 GHz Band

We present results from an analysis of all data taken by the BICEP2 and Keck Array cosmic microwave background (CMB) polarization experiments up to and including the 2014 observing season. This includes the first Keck Array observations at 95 GHz. The maps reach a depth of 50 nK deg in Stokes Q and U in the 150 GHz band and 127 nK deg in the 95 GHz band. We take auto- and cross-spectra between these maps and publicly available maps from WMAP and Planck at frequencies from 23 to 353 GHz. An excess over lensed ΛCDM is detected at modest significance in the 95×150 BB spectrum, and is consistent with the dust contribution expected from our previous work. No significant evidence for synchrotron emission is found in…

• NS
  National Science Foundation

  Awards: ANT-1145143 (Minnesota), ANT-1145172 (Harvard), ANT-1145248 (Stanford)
• UD
  U.S. Department of Energy
• NA
  National Aeronautics and Space Administration
• WM
  W. M. Keck Foundation
• GA
  Gordon and Betty Moore Foundation
• CI
  California Institute of Technology
• HU
  Harvard University
• CF
  Canada Foundation for Innovation
• OO
  Office of Science
• SA
  Science and Technology Facilities Council

  Award: ST/N000706/1
• SN
  SLAC National Accelerator Laboratory