Publicly available data
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The VSA team proudly invites you to download the latest data. The new results, incorporating observations made by the telescope in both configurations, were released on 20th December 2002.
The full VSA power spectrum, measured out to l = 1400:
VSA-0212.tar.gz
This data has been formatted so that the input file can be used in
Antony Lewis's cosmomc
program. There are sixteen data points, corresponding to the final power
spectrum.
The format of the full dataset is ASCII and simple. The units are
microK^2.
VSA.dataset is a self-explanatory root file. There is no beam
uncertainity for VSA data and the overall calibration uncertainity is
7%. After the header, there are sixteen data points corresponding to the
peak of the likelihood of the power spectrum.
VSA_x.dat The x-factors for the VSA dataset (as explained in astro-ph/9808264, for
example).
VSA_matrix.dat is the Hessian matrix of the VSA dataset in the
log-offset variables. 16^2=256 numbers are given. Because the matrix is
symmetric, the order does not matter.
The chi^2 is given by
where B_i are theoretical bandpowers, x_i are the x-factors
and O_i are the observed powers in the offset-log-normal variables
(O_i=log(O_i0+x_i))
windows/VSA* are 16 files with window functions corresponding
to datapoints. Each window file has two columns, the l value and the
corresponding weight.
Please contact Anze Slosar for
any queries regarding the interpretation of the above numbers.
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Last Modified 17th November 2003
Webpage Administrator.