First results from the Very Small Array - IV. Cosmological parameter estimation

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

    Research output: Contribution to journalArticlepeer-review


    We investigate the constraints on basic cosmological parameters set by the first compact-configuration observations of the Very Small Array (VSA), and other cosmological data sets, in the standard inflationary ΛCDM model. Using the weak priors 40 <H0 <90 km s-1 Mpc -1 and 0 <ι <0.5, we find that the VSA and COBE-DMR data alone produce the constraints Ωtot = 1.03 -0.12+0.12, Ωbh2 = 0.029 -0.009+0.009, Ωcdmh2 = 0.13-0.05+0.08 and ns = 1.04 -0.08+0.11 at the 68 per cent confidence level. Adding in the Type la supernova constraints, we additionally find Ωm = 0.32-0.06+0.09 and ΩΛ = 0.71 -0.07+0.07. These constraints are consistent with those found by the BOOMERanG, DASI and MAXIMA experiments. We also find that, by combining all these cosmic microwave background experiments and assuming the Hubble Space Telescope Key Project limits for H0 (for which the X-ray plus Sunyaev-Zel'dovich route gives a similar result), we obtain the tight constraints Ωm = 0.28-0.07+0.14 and ΩΛ = 0.72-0.13+0.07, which are consistent with, but independent of, those obtained using the supernova data.
    Original languageEnglish
    Pages (from-to)1084-1092
    Number of pages8
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number4
    Publication statusPublished - 1 Jun 2003


    • Cosmic microwave background
    • Cosmological parameters
    • Cosmology: observations


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