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Beating Lensing Cosmic Variance with Galaxy Tomography | | Ue-Li Pen
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31 Dec 2003 | | Journal: | Mon.Not.Roy.Astron.Soc. 350 (2004) 1445 | | Subject: | astro-ph | | Abstract: | I discuss the use of cross correlations between galaxies with distance information and projected weak lensing dark matter maps to obtain a fully three dimensional dark matter map and power spectrum. On large scales l<100 one expects the galaxies to be biased, but not stochastic. I show that this allows a simultaneous solution of the full 3-D evolving galaxy bias and the dark matter power spectrum simultaneously. Within the photo-z information of the CFH lensing legacy survey, this allows a threefold reduction of statistical error, while a cross correlation with CLAR or other deep spectroscopic surveys allows a tenfold improvement in dark matter power accuracy on linear scales. This makes lensing surveys more sensitive to the cosmic equation of state and the neutrino masses. | | Source: | arXiv, astro-ph/0402008 | | Services: | Forum | Review | PDF | Favorites | |
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