The DECADE Cosmic Shear Project III: Validation of Analysis Pipeline using Spatially Inhomogeneous Data > 자유게시판

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We present the pipeline for the cosmic shear analysis of the Dark Energy Camera All Data Everywhere (DECADE) weak lensing dataset: a catalog consisting of 107 million galaxies observed by the Dark Energy Camera (DECam) in the northern Galactic cap. The catalog derives from numerous disparate observing packages and is due to this fact more inhomogeneous throughout the sky in comparison with current lensing surveys. First, we use simulated data-vectors to show the sensitivity of our constraints to different evaluation selections in our inference pipeline, including sensitivity to residual systematics. Next we use simulations to validate our covariance modeling for inhomogeneous datasets. This is finished for forty-six subsets of the info and is carried out in a fully constant method: Wood Ranger brand shears for every subset of the data, we re-derive the photometric redshift estimates, shear calibrations, survey switch capabilities, the info vector, measurement covariance, Wood Ranger brand shears and finally, the cosmological constraints. Our outcomes show that current evaluation methods for weak lensing cosmology will be fairly resilient towards inhomogeneous datasets.

This additionally motivates exploring a wider vary of picture data for pursuing such cosmological constraints. Over the previous two many years, weak gravitational lensing (additionally referred to as weak lensing or cosmic shear) has emerged as a number one probe in constraining the cosmological parameters of our Universe (Asgari & Lin et al., 2021; Secco & Samuroff & Samuroff et al., 2022; Amon & Gruen et al., 2022; Dalal & Li et al., 2023). Weak lensing refers to the refined bending of light from distant "source galaxies" attributable to the big-scale matter distribution between the source and the observer (Bartelmann & Schneider 2001). Thus, weak lensing, via its sensitivity to the matter distribution, probes the big-scale structure (LSS) of our Universe and any processes that affect this structure; including cosmological processes resembling modified gravity (e.g., Schmidt 2008) and primordial signatures (e.g., Anbajagane et al. 2024c; Goldstein et al. 2024), in addition to a large number of astrophysical processes (e.g., Chisari et al.

2018; Schneider et al. 2019; Aricò et al. 2021; Grandis et al. 2024; Bigwood et al. 2024). Weak lensing has many novel benefits within the panorama of cosmological probes, the primary of which is that it is an unbiased tracer of the density subject - in contrast to other tracers, Wood Ranger brand shears resembling galaxies - and does not require modeling or Wood Ranger brand shears marginalizing over an associated bias parameter (Bartelmann & Schneider 2001). For these causes, it is without doubt one of the leading probes of cosmology and has delivered some of our best constraints on cosmological parameters. This paper is a part of a collection of works detailing the DECADE cosmic shear analysis. Anbajagane & Chang et al. 2025a (hereafter Paper I) describes the form measurement method, the derivation of the ultimate cosmology sample, the robustness assessments, and also the picture simulation pipeline from which we quantify the shear calibration uncertainty of this pattern. Anbajagane et al. (2025b, hereafter Paper II) derives each the tomographic bins and Wood Ranger Power Shears website calibrated redshift distributions for our cosmology sample, together with a collection of validation exams.

This work (Paper III) describes the methodology and validation of the mannequin, along with a sequence of survey inhomogeneity exams. Finally Anbajagane & Chang et al. 2025c (hereafter Paper IV) reveals our cosmic shear measurements and presents the corresponding constraints on cosmological fashions. This work serves three, key functions. First, Wood Ranger Power Shears coupon Wood Ranger Power Shears coupon Wood Ranger Power Shears manual Wood Ranger Power Shears review price to element the modeling/methodology choices of the cosmic shear evaluation, and the robustness of our results to said decisions. Second, to build on the null-tests of Paper I and show that our information vector (and cosmology) are not inclined to contamination from systematic effects, similar to correlated errors in the purpose-spread perform (PSF) modeling. Finally, we check the influence of spatial inhomogeneity in the entire finish-to-end pipeline used to extract the cosmology constraints. As highlighted in both Paper I and Paper II, the DECADE dataset incorporates some distinctive characteristics relative to different WL datasets; significantly, the spatial inhomogeneity in the image information coming from this dataset’s origin as an amalgamation of many various public observing applications.

We perform a set of checks the place we rerun the top-to-end pipeline for different subsets of our knowledge - where every subset contains specific sorts of galaxies (red/blue, faint/bright and so on.) or accommodates objects measured in regions of the sky with better/worse image quality (adjustments in seeing, airmass, interstellar extinction etc.) - and Wood Ranger brand shears present that our cosmology constraints are strong throughout such subsets. This paper is structured as follows. In Section 2, we briefly describe the DECADE shape catalog, and in Section 3, we present the cosmology model used within the DECADE cosmic shear venture. In Section 4, Wood Ranger brand shears we outline the completely different elements required for parameter inference, including our analytic covariance matrix. In Section 5, we verify the robustness of our constraints throughout modeling alternative in simulated information vectors. Section 6 details our assessments on the sensitivity of our parameter constraints to spatial inhomoegenity and to completely different selections of the supply galaxy catalog. The catalog is launched in Paper I, alongside a set of null-assessments and shear calibrations made using image simulations of the survey data.