# Difference between revisions of "Ready for delensing use lensing maps 02.00"

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/project/projectdirs/cmbs4/reanalysis/phi_recons/02.00_carron_180920/plms_sepTP_apo_lmin200lmax3000_fsky5pc_cut10_180925/ready_for_delensing_use | /project/projectdirs/cmbs4/reanalysis/phi_recons/02.00_carron_180920/plms_sepTP_apo_lmin200lmax3000_fsky5pc_cut10_180925/ready_for_delensing_use | ||

− | These maps were directly built from the quadratic estimated raw lensing maps [[Lensing reconstructions 02.00]], after Wiener-filtering and mean-field subtraction, as described below. They can be used as is for delensing. | + | These maps were directly built from the quadratic estimated raw lensing maps [[Lensing reconstructions 02.00]], after Wiener-filtering and mean-field (contamination of the lensing estimate by mask and noise anisotropies) subtraction, as described below. They can be used as is for delensing. |

There are 3 types of maps: | There are 3 types of maps: | ||

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=== Wiener-filter === | === Wiener-filter === | ||

+ | |||

The Wiener-filter C / C + N0 is isotropic, and is given by the last column of the files | The Wiener-filter C / C + N0 is isotropic, and is given by the last column of the files | ||

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in the same folder. The noise spectra are obtained empirically, by taking (twice) the spectrum of a lensing reconstruction where the two legs of the quadratic estimator are independent, and averaging over 100 such reconstructions. | in the same folder. The noise spectra are obtained empirically, by taking (twice) the spectrum of a lensing reconstruction where the two legs of the quadratic estimator are independent, and averaging over 100 such reconstructions. | ||

+ | |||

+ | === Mean-fields === | ||

+ | |||

+ | To subtract the mean-field from one lensing estimate, we have subtracted the average of the lensing reconstructions, excluding that very estimate (resulting in the average of 99 lensing maps). This adds a small, ~1% contribution to the reconstruction noise which is neglected in the Wiener-filter. This procedure also causes the simulations to be not exactly independent anymore, even if this is a small effect. |

## Revision as of 16:17, 30 September 2018

J. Carron Sept 30 2018.

This page describe the 300 lensing tracers maps (healpy alm fits files, with lmax=3000) available at

/project/projectdirs/cmbs4/reanalysis/phi_recons/02.00_carron_180920/plms_sepTP_apo_lmin200lmax3000_fsky5pc_cut10_180925/ready_for_delensing_use

These maps were directly built from the quadratic estimated raw lensing maps Lensing reconstructions 02.00, after Wiener-filtering and mean-field (contamination of the lensing estimate by mask and noise anisotropies) subtraction, as described below. They can be used as is for delensing.

There are 3 types of maps:

- sim_ptt_????_lmax3000.fits

built from temperature data only, with ???? from 0000 to 0099

- sim_p_p_????_lmax3000.fits

built from polarization data only,

- sim_p_????_lmax3000.fits

built from combination and temperature and polarization data.

### Wiener-filter

The Wiener-filter C / C + N0 is isotropic, and is given by the last column of the files

clwf_{ptt, p_p, p}.dat

in the same folder. The noise spectra are obtained empirically, by taking (twice) the spectrum of a lensing reconstruction where the two legs of the quadratic estimator are independent, and averaging over 100 such reconstructions.

### Mean-fields

To subtract the mean-field from one lensing estimate, we have subtracted the average of the lensing reconstructions, excluding that very estimate (resulting in the average of 99 lensing maps). This adds a small, ~1% contribution to the reconstruction noise which is neglected in the Wiener-filter. This procedure also causes the simulations to be not exactly independent anymore, even if this is a small effect.