Wilkinson Microwave Anisotropy Probe
Analysis of the WMAP data involved the computation of cosmological parameters assuming a variety of models and including a variety of datasets in addition to the WMAP dataset. The various model/dataset combinations that were tested are displayed in a matrix; the combinations that were analyzed have links in the corresponding cells to individual display pages that show the cosmological parameters computed using that combination of model and dataset. A printable version of each list of parameters is made available as a Postscript file through a link its corresponding the individual display page.
This table is formatted somewhat differently that it has been in the past. In most cases, parameters including the H0 and BAO datasets were computed for each model/dataset combination shown in the table by extending the processing for the displayed combinations. Therefore, these parameters are displayed on each subpage instead of these two datasets populating this table. Where available, a single set of chains for the four permutations are provided (combination, combo+HO, combo+BAO, and combo+BAO+H0).
Mnemonics are used to identify the models and datasets in the table and the individual model/dataset displays. The following table translate the mnemonics:
1 RECFAST is the code included in the Code for Anisotropies in the Microwave Background (CAMB) that calculates the fractional ionization of the light elements in the universe for a range or redshifts around z=1000 for the purpose of determining the cosmic microwave background power spectra.
As mentioned previously, each displayed model/dataset combination has an individual display page that shows the WMAP measurements of the cosmological parameters, with a link to a Postscript file showing the same parameters. These display pages also contain links to files containing WMAP's best fit Cl's, best fit matter power spectra, and Monte Carlo Markov Chains. The Markov Chain are supplied in a compressed tarball that contains a README file describing the contents. The spectra files contain:
Note regarding baryon drag epoch redshift and BAO constraints:
The baryon drag epoch redshift (zd), sound horizon (rs), and quantities measured in BAO surveys (e.g., rs/Dv) that are reported in the WMAP 9-year parameter tables were calculated using the approximation from Eisenstein & Hu (1998). This was done to be consistent with results reported by BAO surveys at the time. More recent results have typically been reported using a more accurate calculation of zd, for instance using CAMB. This results in an increase in rs by around 2.5% for the ΛCDM model. This correction is discussed in more detail in Appendix B of Hamann et al. (2010).