Difference between revisions of "Checking BB purity in re-analysis for alternate masks"

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(Created page with "October 26 2018, Clem Pryke Recently we have been looking at results of sims run with more realistic Chile and Pole sky hit maps. See [http://bicep2.rc.fas.harvard.edu/CMB-S4...")
 
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See [http://bicep2.rc.fas.harvard.edu/CMB-S4/analysis_logbook/20180831_dc04_abc_model00_07_ML_proper_bp]
 
See [http://bicep2.rc.fas.harvard.edu/CMB-S4/analysis_logbook/20180831_dc04_abc_model00_07_ML_proper_bp]
 
[http://bicep2.rc.fas.harvard.edu/CMB-S4/analysis_logbook/20180925_bkfinal_04bc/]
 
[http://bicep2.rc.fas.harvard.edu/CMB-S4/analysis_logbook/20180925_bkfinal_04bc/]
[https://cmb-s4.org/wiki/index.php/Sims_with_nominal_Chile_and_Pole_masks_II] and
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[[Sims_with_nominal_Chile_and_Pole_masks_II]] and
[[Sims_with_nominal_Chile_and_Pole_masks]]
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[[Sims_with_nominal_Chile_and_Pole_masks]].
  
The parametric re-analysis uses
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The parametric re-analysis uses a pureB estimator from S2HAT as described in the intro
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to [http://bicep2.rc.fas.harvard.edu/CMB-S4/analysis_logbook/20170224_cmbs4_dc1_final].
 +
 
 +
To check if this estimator is producing sufficient B-mode purity when run with the
 +
more realistic masks I added processing of the unlensed-LCDM maps to the pipeline through
 +
to power spectra.
 +
Since these contain zero input B-modes whatever BB power they show on output is due
 +
to E to B mixing.
 +
The plot below shows the results for the bandpowers we use in the re-analysis.
 +
Clearly the 04 mask needs more smoothing.
 +
Since this plot is for A_L=1 we might expect to see some bias on r in the 04b mask results
 +
although I don't think we do.
 +
 
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[[File:181026_f1.gif|border]]

Revision as of 20:26, 26 October 2018

October 26 2018, Clem Pryke

Recently we have been looking at results of sims run with more realistic Chile and Pole sky hit maps. See [1] [2] Sims_with_nominal_Chile_and_Pole_masks_II and Sims_with_nominal_Chile_and_Pole_masks.

The parametric re-analysis uses a pureB estimator from S2HAT as described in the intro to [3].

To check if this estimator is producing sufficient B-mode purity when run with the more realistic masks I added processing of the unlensed-LCDM maps to the pipeline through to power spectra. Since these contain zero input B-modes whatever BB power they show on output is due to E to B mixing. The plot below shows the results for the bandpowers we use in the re-analysis. Clearly the 04 mask needs more smoothing. Since this plot is for A_L=1 we might expect to see some bias on r in the 04b mask results although I don't think we do.

181026 f1.gif