First results from the Very Small Array -- III. The CMB power spectrum
Paul F. Scott, Pedro Carreira, Kieran Cleary, Rod D. Davies, Richard Davis, Clive Dickinson, Keith Grainge, Carlos Gutierrez, Michael P. Hobson, Michael E. Jones, Ruediger Kneissl, Anthony Lasenby, Klaus Maisinger, Guy Pooley, Rafael Rebolo, Jose Alberto Rubino Martin, Pedro Sosa Molina, Ben Rusholme, Richard Saunders, Richard Savage, Anze Slosar, Angela C. Taylor, David Titterington, Elizabeth Waldram, Robert A. Watson, Althea Wilkinson
Abstract
We present the power spectrum of the fluctuations in the cosmic microwave background detected by the Very Small Array (VSA) in its first season of observations in its compact configuration. We find clear detections of first and second acoustic peaks at l~200 and l~550, plus detection of power on scales up to l=800. The VSA power spectrum is in very good agreement with the results of the Boomerang, Dasi and Maxima telescopes despite the differing potential systematic errors.
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