Lensing map reconstruction from 02.00 sims w/ and w/o foreground+inhomogeneous noise

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Septemper 26, 2018 (Toshiya Namikawa posted)


In this posting, I show some results of the reconstruction of the CMB lensing kappa map from the signal only or signal+noise+foreground simulations. I used two quadratic estimators, TT and EB, and show that the reconstructed kappa map looks agree with the input kappa map even after including the noise and foreground. However, the reconstruction noise becomes larger at smaller scales of the reconstructed kappa. This could affect the delensing efficiency.


Following [1], I use the following simulation data set:

- The high res masked lensed-LCDM single frequency map /project/projectdirs/cmbs4/data_xx.yy/02.00/cmbs4_02_llcdm_f145_b04_ellmin30_map_2048_mc_0000.fits

- The high res masked lensed-LCDM + noise + foreground single frequency map /project/projectdirs/cmbs4/data_xx.yy/02.00/cmbs4_02.00_comb_f145_b04_ellmin30_map_2048_mc_0000.fits

- Relative hits mask /project/projectdirs/cmbs4/expt_xx/02/rhits/n2048.fits.

- The true input phi map /project/projectdirs/cmb/data/generic/cmb/ffp10/mc/scalar/ffp10_unlensed_scl_cmb_000_tebplm_mc_0000.fits (4th binary table)


Fig kmap input.jpg

Fig.1: Example of the input kappa map after applying the mask. The kappa multipole at 50<L<200 is included in the fluctuations.

Fig kmap recon.jpg

Fig.2: Same as Fig.1 but for the reconstructed kappa map from signal+noise+foreground simulation.