Academic Journal
BeyondPlanck VII. Bayesian estimation of gain and absolute calibration for cosmic microwave background experiments
| العنوان: | BeyondPlanck VII. Bayesian estimation of gain and absolute calibration for cosmic microwave background experiments |
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| المؤلفون: | Gjerløw, E., Ihle, H. T., Galeotta, S., Andersen, K. J., Aurlien, R., Banerji, R., Bersanelli, M., Bertocco, S., Brilenkov, M., Carbone, M., Colombo, L. P. L., Eriksen, H. K., Foss, M. K., Franceschet, C., Fuskeland, U., Galloway, M., Gerakakis, S., Hensley, B., Herman, D., Iacobellis, M., Ieronymaki, M., Jewell, J. B., Karakci, A., Keihänen, E., Keskitalo, R., Maggio, G., Maino, D., Maris, M., Paradiso, S., Partridge, B., Reinecke, M., Suur-Uski, A. -S., Svalheim, T. L., Tavagnacco, D., Thommesen, H., Watts, D. J., Wehus, I. K., Zacchei, A. |
| المساهمون: | E. Gjerløw, H.T. Ihle, S. Galeotta, K.J. Andersen, R. Aurlien, R. Banerji, M. Bersanelli, S. Bertocco, M. Brilenkov, M. Carbone, L.P.L. Colombo, H.K. Eriksen, M.K. Fo, C. Franceschet, U. Fuskeland, M. Galloway, S. Gerakaki, B. Hensley, D. Herman, M. Iacobelli, M. Ieronymaki, J.B. Jewell, A. Karakci, E. Keihänen, R. Keskitalo, G. Maggio, D. Maino, M. Mari, S. Paradiso, B. Partridge, M. Reinecke, A.-. Suur-Uski, T.L. Svalheim, D. Tavagnacco, H. Thommesen, D.J. Watt, I.K. Wehu, A. Zacchei |
| بيانات النشر: | EDP Sciences |
| سنة النشر: | 2023 |
| المجموعة: | The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
| مصطلحات موضوعية: | cosmic background radiation / cosmology: observations / early Universe / inflation / methods: data analysis / methods: statistical, Settore FIS/05 - Astronomia e Astrofisica |
| الوصف: | We present a Bayesian calibration algorithm for cosmic microwave background (CMB) observations as implemented within the global end-to-end BEYONDPLANCK framework and applied to the Planck Low Frequency Instrument (LFI) data. Following the most recent Planck analysis, we decomposed the full time-dependent gain into a sum of three nearly orthogonal components: one absolute calibration term, common to all detectors, one time-independent term that can vary between detectors, and one time-dependent component that was allowed to vary between one-hour pointing periods. Each term was then sampled conditionally on all other parameters in the global signal model through Gibbs sampling. The absolute calibration is sampled using only the orbital dipole as a reference source, while the two relative gain components were sampled using the full sky signal, including the orbital and Solar CMB dipoles, CMB fluctuations, and foreground contributions. We discuss various aspects of the data that influence gain estimation, including the dipole-polarization quadrupole degeneracy and processing masks. Comparing our solution to previous pipelines, we find good agreement in general, with relative deviations of −0.67% (−0.84%) for 30 GHz, 0.12% (−0.04%) for 44 GHz and −0.03% (−0.64%) for 70 GHz, compared to Planck PR4 and Planck 2018, respectively. We note that the BEYONDPLANCK calibration was performed globally, which results in better inter-frequency consistency than previous estimates. Additionally, WMAP observations were used actively in the BEYONDPLANCK analysis, which both breaks internal degeneracies in the Planck data set and results in an overall better agreement with WMAP. Finally, we used a Wiener filtering approach to smoothing the gain estimates. We show that this method avoids artifacts in the correlated noise maps as a result of oversmoothing the gain solution, which is difficult to avoid with methods like boxcar smoothing, as Wiener filtering by construction maintains a balance between data fidelity and prior knowledge. ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:001025100700019; volume:675; firstpage:1; lastpage:19; numberofpages:19; journal:ASTRONOMY & ASTROPHYSICS; https://hdl.handle.net/2434/981608; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85164167032 |
| DOI: | 10.1051/0004-6361/202244061 |
| الاتاحة: | https://hdl.handle.net/2434/981608 https://doi.org/10.1051/0004-6361/202244061 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.B0272C90 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1051/0004-6361/202244061 |
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