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Apr 20 2018, Clem Pryke

We wish to use PySM maps for PICO sims. (See [https://arxiv.org/abs/1608.02841 PySM paper] and [https://github.com/bthorne93/PySM_public git repo].)

PySM can be run at any nside up to 512. What it does internally I have not investigated. It can also be told to smooth the output maps to a given beam size.

To be realistic we would generate PICO maps with the resolution varying by band as per imageroptions. However, it appears PySM applies the requested smoothing in harmonic space and, because the dynamic range of the foreground maps is large, such smoothing is problematic.

Here is the PySM map at 150 GHz for model a2d4f1s3 in T:

Now I smooth the above with 120 arcmin beam and take the difference of smoothed minus unsmoothed: