Instrumental systematics biases in CMB lensing reconstruction - Antony Lewis.pdf (4.79 MB)
Instrumental systematics biases in CMB lensing reconstruction: a simulation-based assessment
journal contribution
posted on 2023-06-10, 00:19 authored by Mark Mirmelstein, Giulio Fabbian, Antony LewisAntony Lewis, Julien PelotonJulien PelotonWeak gravitational lensing of the cosmic microwave background (CMB) is an important cosmological tool that allows us to learn about the structure, composition and evolution of the Universe. Upcoming CMB experiments, such as the Simons Observatory (SO), will provide high-resolution and low-noise CMB measurements. We consider the impact of instrumental systematics on the corresponding high-precision lensing reconstruction power spectrum measurements. We simulate CMB temperature and polarization maps for an SO-like instrument and potential scanning strategy, and explore systematics relating to beam asymmetries and offsets, boresight pointing, polarization angle, gain drifts, gain calibration and electric crosstalk. Our analysis shows that the majority of the biases induced by the systematics we modeled are below a detection level of ~0.6s. We discuss potential mitigation techniques to further reduce the impact of the more significant systematics, and pave the way for future lensing-related systematics analyses.
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Publication status
- Published
File Version
- Accepted version
Journal
Physical Review DISSN
2470-0010Publisher
American Physical SocietyExternal DOI
Issue
12Volume
103Page range
1-27Article number
a123540Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-07-12First Open Access (FOA) Date
2021-07-12First Compliant Deposit (FCD) Date
2021-07-09Usage metrics
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