Closing the Loop: Joint Analysis of CMB Systematics and Foregrounds
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Abstract
The Cosmic Microwave Background (CMB) radiation is the oldest signal in the universe. It teaches us about the first moments after the universe came into existence, and thus informs us about its subsequent evolution. The CMB serves as the faint backdrop of the night sky, obscured by all the other astrophysical objects (primarily clouds of gas), which we call foregrounds. For precise measurements of the CMB, we require detailed characterization of these, and also of the observing instruments' systematics. Furthermore, the problems of foreground separation and instrument systematics are tightly interwoven. This thesis presents my work on disentangling this relationship. This is done by leveraging observations from several different experiments and simultaneous consideration of systematics and foregrounds in a “loop”-like manner. Through the application of these methods, my colleagues and I have created some of the cleanest maps of the sky in the microwave range, in the world. These maps in turn inform us about important properties of the universe.List of papers
Paper I: R. Keskitalo, T. L. Svalheim, and the Planck Collaboration. “Planck intermediate results LVII. Joint Planck LFI and HFI data processing”. In: A&A, November 2020, vol. 643, A42. DOI: 10.1051/0004-6361/202038073. The article is included in the thesis. Also available at: https://doi.org/10.1051/0004-6361/202038073 |
Paper II: M. Tristram, A. J. Banday, K. M. Górski, R. Keskitalo, C. R. Lawrence, K. J. Andersen, R. B. Barreiro, J. Borrill, L. P. L. Colombo, H. K. Eriksen, R. Fernandez-Cobos, T. S. Kisner, E. Martínez-González, B. Partridge, D. Scott, T. L. Svalheim and I. K. Wehus. “Improved limits on the tensor-to-scalar ratio using BICEP and Planck”. In: A&A, to be submitted, arXiv: 2112.07961v1. To be published. The paper is not available in DUO awaiting publishing. |
Paper III: The BeyondPlanck Collaboration. “BeyondPlanck I. Global Bayesian analysis of the Planck Low Frequency Instrument data”. In: A&A, to be submitted, arXiv:2011.05609v1. To be published. The paper is not available in DUO awaiting publishing. |
Paper IV: K. J. Andersen, H. K. Eriksen, T. L. Svalheim and the BeyondPlanck Collaboration. “BeyondPlanck XIV. Intensity foregrounds, degeneracies and priors” In: A&A, to be submitted, arXiv: 2201.08188v1. To be published. The paper is not available in DUO awaiting publishing. |
Paper V: T. L. Svalheim and the BeyondPlanck Collaboration. “BeyondPlanck XV. Polarized foreground emission between 30 and 70 GHz”. In: A&A, Forthcoming article. DOI: 10.1051/0004-6361/202243160. To be published. The paper is not available in DUO awaiting publishing. |
Paper VI: T. L. Svalheim and the BeyondPlanck Collaboration. “BeyondPlanck X. Bandpass and beam leakage corrections”. In: A&A, Forthcoming article. DOI: 10.1051/0004-6361/202243080. To be published. The paper is not available in DUO awaiting publishing. |