The cosmic microwave background power spectrum out ℓ = 1400 measured by the Very Small Array

Keith Grainge, Pedro Carreira, Kieran Cleary, Rod D. Davies, Richard J. Davis, Clive Dickinson, Ricardo Genova-Santos, Carlos M. Gutiérrez, Yaser A. Hafez, Michael P. Hobson, Michael E. Jones, Rüdiger Kneissl, Katy Lancaster, Anthony Lasenby, J. P. Leahy, Klaus Maisinger, Guy G. Pooley, Rafael Rebolo, José Alberto Rubiño-Martin, Pedro J. Sosa MolinaCarolina Ödman, Ben Rusholme, Richard D E Saunders, Richard Savage, Paul F. Scott, Anže Slosar, Angela C. Taylor, David Titterington, Elizabeth Waldram, Robert A. Watson, Althea Wilkinson

    Research output: Contribution to journalArticlepeer-review


    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° 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 and 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.
    Original languageEnglish
    Pages (from-to)L23-L28
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number4
    Publication statusPublished - 1 Jun 2003


    • Cosmic microwave background
    • Cosmology: observations


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