arXiv · astro-ph/0212495
The CMB power spectrum out to l=1400 measured by the VSA
Abstract
We have observed the cosmic microwave background (CMB) in three regions of sky using the Very Small Array (VSA) in an extended configuration with antennas of beamwidth 2 degrees at 34 GHz. Combined with data from previous VSA observations using a more compact array with larger beamwidth, we measure the power spectrum of the primordial CMB anisotropies between angular multipoles l = 160 - 1400. Such measurements at high l are vital for breaking degeneracies in parameter estimation from the CMB power spectrum and other cosmological data. The power spectrum clearly resolves the first three acoustic peaks, shows the expected fall off in power at high l and starts to constrain the position and height of a fourth peak.
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Keith Grainge, Pedro Carreira, Kieran Cleary, Rod D. Davies, Richard J. Davis, Clive Dickinson, Ricardo Genova-Santos, Carlos M. Gutierrez, Yaser A. Hafez, Michael P. Hobson, Michael E. Jones, Rudiger Kneissl, Katy Lancaster, Anthony Lasenby, J. P. Leahy, Klaus Maisinger, Guy G. Pooley, Rafael Rebolo, Jose Alberto Rubino-Martin, Pedro Sosa Molina, Carolina Odman, Ben Rusholme, Richard D. E. Saunders, Richard Savage, Paul F. Scott, Anze Slosar, Angela C. Taylor, David Titterington, Elizabeth Waldram, Robert A. Watson, Althea Wilkinson. 2003-03-05. The CMB power spectrum out to l=1400 measured by the VSA. https://doi.org/10.1046/j.1365-8711.2003.06563.x
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