ACT (DR6.02) Pspipe Window Functions

This folder contains the window functions, in CAR pixelization and equatorial coordinates, applied to the DR6 data. The window functions correspond to the mask applied before taking the power spectrum. We use the same window function for temperature and polarization.

window_*_baseline is the main window used in DR6 analysis. It consists of the product of:

an edge mask
a galactic mask
a source mask
The different components are apodized to regularize the harmonic space transform.

window_*_baseline_ivar corresponds to the window function multiplied by an inverse variance map. These are used in particular in the context of polarization angle estimation.

Additionally,
window_*_kspace corresponds to the window function we use before applying our Fourier space filter. It contains only an edge mask and a galactic mask.

Script for computing the window functions

The computation of the window functions is done with the following script in PSpipe v1.0: https://github.com/simonsobs/PSpipe/blob/master/project/ACT_DR6/python/get_window_dr6.py

File structure

For each array band, there are baseline, baseline_ivar, and k-space window functions. We provide windows for the DR6 pipeline and for the DR6xPlanck pipeline. The main difference is the increasing size of the source mask used for the latter: we use a 12-arcminute hole for DR6xPlanck and a 5-arcminute hole for DR6.

File format

Each window consists of a single FITS file. It can be read using the "read_map" function of the pixell library: https://github.com/simonsobs/pixell/blob/master/pixell/enmap.py

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