Kavli Affiliate: Anthony Challinor
| First 5 Authors: , , , ,
| Summary:
Motivated by observed discrepancies between the Atacama Cosmology Telescope
Data Release 4 (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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