The Simons Observatory: impact of bandpass, polarization angle and calibration uncertainties on small-scale power spectrum analysis
Abstract We study the effects due to mismatches in passbands, polarization angles, and temperature and polarization calibrations in the context of the upcoming cosmic microwave background experiment Simons Observatory (SO). Using the SO multi-frequency likelihood, we estimate the bias and the degradation of constraining power in cosmological and astrophysical foreground parameters assuming different levels of knowledge of the instrumental effects. We find that incorrect but reasonable assumptions about the values of all the systematics examined here can have significant effects on cosmological analyses, hence requiring marginalization approaches at the likelihood level. When doing so, we find that the most relevant effect is due to bandpass shifts. When marginalizing over them, the posteriors of parameters describing astrophysical microwave foregrounds (such as radio point sources or dust) get degraded, while cosmological parameters constraints are not significantly affected. Marginalization over polarization angles with up to 0.25 ° uncertainty causes an irrelevant bias ≲ 0.05 σ in all parameters. Marginalization over calibration factors in polarization broadens the constraints on the effective number of relativistic degrees of freedom N eff by a factor 1.2, interpreted here as a proxy parameter for non standard model physics targeted by high-resolution CMB measurements.
Authors
- Boris Bolliet (ORCID: https://orcid.org/0000-0003-4922-7401)
- Sara M. Simon (ORCID: https://orcid.org/0000-0001-9221-7802)
- I. Harrison (ORCID: https://orcid.org/0000-0002-4437-0770)
- C. L. Reichardt (ORCID: https://orcid.org/0000-0003-2226-9169)
- L. Pagano
- Hidde T. Jense (ORCID: https://orcid.org/0000-0002-9429-0015)
- M. Lattanzi (ORCID: https://orcid.org/0000-0003-1059-2532)
- M. Gerbino (ORCID: https://orcid.org/0000-0002-3538-1283)
- Giuseppe Puglisi (ORCID: https://orcid.org/0000-0002-0689-4290)
- David Alonso (ORCID: https://orcid.org/0000-0002-4598-9719)
- Gabriele Coppi (ORCID: https://orcid.org/0000-0002-6362-6524)
- Brian Keating (ORCID: https://orcid.org/0000-0003-3118-5514)
- Erminia Calabrese (ORCID: https://orcid.org/0000-0003-0837-0068)
- S. Giardiello (ORCID: https://orcid.org/0000-0002-8340-3715)
- Benjamin Beringue (ORCID: https://orcid.org/0000-0001-9571-6148)
- J. Colin Hill (ORCID: https://orcid.org/0000-0002-9539-0835)
- Giulio Fabbian (ORCID: https://orcid.org/0000-0002-3255-4695)
- Adrien La Posta (ORCID: https://orcid.org/0000-0002-2613-2445)
- A.I. Lonappan (ORCID: https://orcid.org/0000-0003-1200-9179)
- Josquin Errard (ORCID: https://orcid.org/0000-0002-1419-0031)
Institutions
- University of Rome Tor Vergata (IT)
- Fermi National Accelerator Laboratory (US)
- The University of Melbourne (AU)
- University of Ferrara (IT)
- Université Paris Cité (FR)
- University of Cambridge (GB)
- Laboratoire AstroParticule et Cosmologie (FR)
- University of California San Diego (US)
- University of Catania (IT)
- University of Oxford (GB)
- Institut d'Astrophysique Spatiale (FR)
- Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT)
- Osservatorio Astrofisico di Catania (IT)
- University of Milano-Bicocca (IT)
- Columbia University (US)
- Cardiff University (GB)
Publication Details
- Journal
- Journal of Cosmology and Astroparticle Physics
- Published
- 2024-09-01
- DOI
- https://doi.org/10.1088/1475-7516/2024/09/008
- Citations
- 4
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 1.33
Funders
- U.S. Department of Energy
- UK Research and Innovation
- European Commission
- Office of Science
- Science and Technology Facilities Council
- High Energy Physics