Open AccessFirst results from the Very Small Array – IV. Cosmological parameter estimation
Author(s) -
RubiñoMartin José Alberto,
Rebolo Rafael,
Carreira Pedro,
Cleary Kieran,
Davies Rod D.,
Davis Richard J.,
Dickinson Clive,
Grainge Keith,
Gutiérrez Carlos M.,
Hobson Michael P.,
Jones Michael E.,
Kneissl Rüdiger,
Lasenby Anthony,
Maisinger Klaus,
Ödman Carolina,
Pooley Guy G.,
Sosa Molina Pedro J.,
Rusholme Ben,
Saunders Richard D. E.,
Savage Richard,
Scott Paul F.,
Slosar Anže,
Taylor Angela C.,
Titterington David,
Waldram Elizabeth,
Watson Robert A.,
Wilkinson Althea
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06494.x
Subject(s) - physics , cosmic microwave background , supernova , astrophysics , hubble's law , parameter space , maxima , cosmic background radiation , cosmic cancer database , inflation (cosmology) , prior probability , cosmology , dark energy , astronomy , statistics , quantum mechanics , bayesian probability , art , mathematics , anisotropy , performance art , art history
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 < H 0 < 90 km s −1 Mpc −1 and 0 < τ < 0.5 , we find that the VSA and COBE ‐DMR data alone produce the constraints Ω tot = 1.03 +0.12 −0.12 , Ω b h 2 = 0.029 +0.009 −0.009 , Ω cdm h 2 = 0.13 +0.08 −0.05 and n s = 1.04 +0.11 −0.08 at the 68 per cent confidence level. Adding in the Type Ia supernova constraints, we additionally find Ω m = 0.32 +0.09 −0.06 and Ω Λ = 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 H 0 (for which the X‐ray plus Sunyaev–Zel'dovich route gives a similar result), we obtain the tight constraints Ω m = 0.28 +0.14 −0.07 and Ω Λ = 0.72 +0.07 −0.13 , which are consistent with, but independent of, those obtained using the supernova data.