LAMBDA News
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.
Mnemonics are used to identify the models and datasets in the table and the individual model/dataset displays. The following table translate the mnemonics:
| Models | |||
|---|---|---|---|
| Mnemonic | Description | Mnemonic | Description |
| LCDM | ΛCDM | ISO1 | Anticorrelated CDM isocurvature. |
| WCDM | Dark energy equation of state (w) allowed to vary. | ISO2 | Uncorrelated CDM isocurvature. |
| OLCDM | ΩK allowed to vary. | MNU | Massive neutrinos. |
| OWCDM | ΩK and w allowed to vary. | NREL | Number of relativistic species. |
| LENS | Turn on lensing when computing CMB spectrum. | RUN | Running spectral index. |
| SZ | Floating amplitude for SZ spectrum. | TENS | Tensor modes. |
| XE | Two step reionization model. | ||
| Datasets | |||
| Mnemonic | Description | ||
| WMAP | WMAP 5 year data set | ||
| 2DF | 2dF Galaxy Redshift Survey (Cole, et.al., 2005) | ||
| SDSS | Sloan Digital Sky Survey, (Tegmark, et.al., 2004; Eisenstein, et.al., 2005) | ||
| ACB | ACBAR--complete data set (Reichardt, et.al., 2008) | ||
| BAO | Baryonic Acoustic Oscillations (2dF+SDSS combination, Percival 2007) | ||
| EBAO | Eisenstein Baryonic Acoustic Oscillations (SDSS/LRG subsample of BAO) | ||
| SNALL | Supernova "Gold Sample" (Riess, et.al., 2004), Supernova Legacy Survey (SNLS, Astier, et.al., 2005), and SNEssence | ||
| HST | Hubble Space Telescope Key Project (Freedman, et.al., 2001) | ||
| CMB | Boomerang + CBI + VSA + Acbar 2006 | ||
| LRG | Sloan Luminous Red Galaxy Sample (Tegmark 2006) | ||
| LYAPOST | Post-processed with the Lyman-alpha forest data (Seljak, Slosar, and McDonald, 2006) | ||
As mentioned previously, each 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:
- Best fit Cl scalar files contain four columns: l, TT, EE, and TE. The tensor and total files contain five columns: l, TT, EE, BB, and TE. The Cl columns are scaled: T02 l (l + 1) Cl / 2&pi in µK2;
- Best fit matter power spectra files contain two columns. The first column is k/h in units of Mpc-1. The second column is the linear matter power spectrum P(k), defined such that the variance is: σ2 = (2π)-3 ∫d3k P(k)
Additional Information
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from WMAP Data, J. Dunkley, et.al (2008).
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation, E. Komatsu, et.al. (2008)
- WMAP Five Year Explanatory Supplement
- Cole, et.al., 2005, MNRAS, 362, 505
- Eisenstein, et.al., 2005, ApJ, 633, 560
- Kuo, et.al., 2004, ApJ, 600, 32
- Readhead, et.al., 2004, ApJ, 609, 498
- Dickinson, et.al., 2004, MNRAS, 353, 732
- Freedman, et.al., 2004, ApJ, 553, 47
- Tegmark, et.al., 2004, ApJ, 606, 702
- Astier, et.al., 2006, AA, 447, 31
- Riess, et.al., 2004, ApJ, 607, 665
