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galsci / pysm

PySM 3: Sky emission simulations for Cosmic Microwave Background experiments
https://pysm3.readthedocs.io/
BSD 3-Clause "New" or "Revised" License
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Add a note in the docs about the polarization convention? #160

Closed ziotom78 closed 1 year ago

ziotom78 commented 1 year ago

I was looking in the docs to check the polarization convention used by PySM3, but I wasn't able to find it. I assume that it uses the Healpix convention instead of the IAU, as this is what the WMAP and Planck teams have done, but I wanted to be sure.

(See here and here, the two conventions differ for the sign of the Stokes parameter U.)

zonca commented 1 year ago

yes, sure, we always assume the COSMO convention. Is any project you are working on using IAU instead?

I'll think where to put it within the docs.

ziotom78 commented 1 year ago

Thanks for the information! We're in the process of deciding which convention to adopt, but first we wanted to do a survey of what is used by the tools we are using in our simulations.

ziotom78 commented 1 year ago

Sorry, I closed the issue but perhaps you want to keep it open until you update the docs.

zonca commented 1 year ago

I suggest using COSMO. I think in the CMB field everyone always assumes COSMO, it is going to be confusing to use IAU instead.

zonca commented 1 year ago

If I'm not mistaken, in healpy POLCCONV is not handled at all.