Kavli Affiliate: Anthony Challinor
| First 5 Authors: Erik Rosenberg, Steven Gratton, Anthony Challinor, ,
| Summary:
Motivated by observed discrepancies between ACT DR4 and Planck 2018 cosmic
microwave background (CMB) anisotropy power spectra, particularly in the
cross-correlation of temperature and E-mode polarization, we investigate
challenges that may be encountered in the comparison of satellite and
ground-based CMB data. In particular, we focus on the effects of Fourier-space
filtering and masking involving bright point sources. We show that the
filtering operation generates bright cross-shaped artifacts in the map, which
stretch far outside typical point-source masks. If not corrected, these
artifacts can add bias or additional variance to cross-spectra, skewing
results. However we find that the effect of this systematic is not large enough
to explain the ACT-Planck differences presented with ACT DR4.
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