The Atacama Cosmology Telescope: map-based noise simulations for DR6

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dc.contributor.authorAtkins, Zachary
dc.contributor.authorDuivenvoorden, Adriaan J.
dc.contributor.authorCoulton, William R.
dc.contributor.authorQu, Frank J.
dc.contributor.authorAiola, Simone
dc.contributor.authorCalabrese, Erminia
dc.contributor.authorChesmore, Grace E.
dc.contributor.authorChoi, Steve K.
dc.contributor.authorDevlin, Mark J.
dc.contributor.authorDunkley, Jo
dc.contributor.authorHervias-Caimapo, Carlos
dc.contributor.authorGuan, Yilun
dc.contributor.authorLa Posta, Adrien
dc.contributor.authorLi, Zack
dc.contributor.authorLouis, Thibaut
dc.contributor.authorMadhavacheril, Mathew S.
dc.contributor.authorMoodleyno, Kavilan
dc.contributor.authorNaess, Sigurd
dc.contributor.authorNati, Federico
dc.contributor.authorNiemack, Michael D.
dc.contributor.authorPage, Lyman
dc.contributor.authorPuddu, Roberto
dc.contributor.authorSalatino, Maria
dc.contributor.authorSifon, Cristobal
dc.contributor.authorStaggs, Suzanne T.
dc.contributor.authorVargasj, Cristian
dc.contributor.authorVavagiakis, Eve M.
dc.contributor.authorWollack, Edward J.
dc.date.accessioned2025-01-20T17:21:32Z
dc.date.available2025-01-20T17:21:32Z
dc.date.issued2023
dc.description.abstractThe increasing statistical power of cosmic microwave background (CMB) datasets requires a commensurate effort in understanding their noise properties. The noise in maps from ground-based instruments is dominated by large-scale correlations, which poses a modeling challenge. This paper develops novel models of the complex noise covariance structure in the Atacama Cosmology Telescope Data Release 6 (ACT DR6) maps. We first enumerate the noise properties that arise from the combination of the atmosphere and the ACT scan strategy. We then prescribe a class of Gaussian, map-based noise models, including a new wavelet-based approach that uses directional wavelet kernels for modeling correlated instrumental noise. The models are empirical, whose only inputs are a small number of independent realizations of the same region of sky. We evaluate the performance of these models against the ACT DR6 data by drawing ensembles of noise realizations. Applying these simulations to the ACT DR6 power spectrum pipeline reveals a similar to 20% excess in the covariance matrix diagonal when compared to an analytic expression that assumes noise properties are uniquely described by their power spectrum. Along with our public code, mnms, this work establishes a necessary element in the science pipelines of both ACT DR6 and future ground-based CMB experiments such as the Simons Observatory (SO).
dc.fuente.origenWOS
dc.identifier.doi10.1088/1475-7516/2023/11/073
dc.identifier.issn1475-7516
dc.identifier.urihttps://doi.org/10.1088/1475-7516/2023/11/073
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91459
dc.identifier.wosidWOS:001108958100004
dc.issue.numero11
dc.language.isoen
dc.revistaJournal of cosmology and astroparticle physics
dc.rightsacceso restringido
dc.subjectCMBR experiments
dc.subjectStatistical sampling techniques
dc.titleThe Atacama Cosmology Telescope: map-based noise simulations for DR6
dc.typeartículo
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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