Improved simulation of non-Gaussian temperature and polarization CMB maps
arXiv:0909.0009 · doi:10.1088/0067-0049/184/2/264
Abstract
We describe an algorithm to generate temperature and polarization maps of the cosmic microwave background radiation containing non-Gaussianity of arbitrary local type. We apply an optimized quadrature scheme that allows us to predict and control integration accuracy, speed up the calculations, and reduce memory consumption by an order of magnitude. We generate 1000 non-Gaussian CMB temperature and polarization maps up to a multipole moment of l_max = 1024. We validate the method and code using the power spectrum and the fast cubic (bispectrum) estimator and find consistent results. The simulations are provided to the community.
18 pages, 19 figures. Accepted for publication in ApJS. Simulations can be obtained at http://planck.mpa-garching.mpg.de/cmb/fnl-simulations; source code is available at https://github.com/elsner/fnl_mapmaking
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