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Verification of GNILC dust templates d9 d10 d11 #167
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the feature at high ell in the Nside 8192 maps is due to The feature disappears if we mask the galaxy (T plot only): This is a case similar to synchrotron, and is as well related to the "Galactic plane fix", see CMB-S4/s4mapbasedsims#29 (comment). |
Notebook used to create the debugging plots above https://gist.github.com/zonca/881c773ff479146e908378091615e175 (modification of notebook to create the templates which is in the repo already) |
Wow! this is somehow consistent with what we've observed for synchrotron as well #169 (comment) ! is it the |
I am pretty sure here for dust because it doesn't happen at 2048. |
Dust and synchrotron templates are produced in 2 stages.
First the actual modeling is performed at Nside 2048 or lower, then the output products, generally Alm of large scales and C_ell of small scales are saved.
In the second step those artifacts are loaded, a realization of the small scales with a specific seed and ell_max at 16384, then everything is assembled into the templates.
Given #164, it is necessary to verify all outputs more carefully even in the second stage.
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