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

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We current 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 noticed by the Dark Energy Camera (DECam) in the northern Galactic cap. The catalog derives from a large number of disparate observing applications and is subsequently more inhomogeneous across the sky compared to present lensing surveys. First, we use simulated data-vectors to show the sensitivity of our constraints to completely different evaluation choices in our inference pipeline, together with sensitivity to residual systematics. Next we use simulations to validate our covariance modeling for inhomogeneous datasets. This is done for forty-six subsets of the information and is carried out in a fully constant manner: for each subset of the information, we re-derive the photometric redshift estimates, shear calibrations, Wood Ranger Power Shears for sale Wood Ranger Power Shears order now Wood Ranger Power Shears USA Wood Ranger Power Shears specs order now survey transfer features, the information vector, brushless motor shears measurement covariance, and eventually, the cosmological constraints. Our results present that existing analysis strategies for weak lensing cosmology could be fairly resilient in the direction of inhomogeneous datasets.

This also motivates exploring a wider vary of image knowledge for brushless motor shears pursuing such cosmological constraints. Over the previous two many years, weak gravitational lensing (also known as weak lensing or cosmic shear) has emerged as a leading 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 back to the subtle bending of light from distant "source galaxies" resulting from the large-scale matter distribution between the source and the observer (Bartelmann & Schneider 2001). Thus, weak lensing, by way of its sensitivity to the matter distribution, probes the big-scale structure (LSS) of our Universe and any processes that impression this structure; together with cosmological processes corresponding to modified gravity (e.g., Schmidt 2008) and primordial signatures (e.g., Anbajagane et al. 2024c; Goldstein et al. 2024), as well as a large variety 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 advantages within the landscape of cosmological probes, the primary of which is that it is an unbiased tracer of the density discipline - unlike different tracers, corresponding to galaxies - and doesn't require modeling or marginalizing over an associated bias parameter (Bartelmann & Schneider 2001). For these reasons, it is one of the leading probes of cosmology and has delivered some of our greatest constraints on cosmological parameters. This paper is part of a collection of works detailing the DECADE cosmic shear analysis. Anbajagane & Chang et al. 2025a (hereafter Paper I) describes the form measurement technique, the derivation of the final cosmology sample, the robustness checks, and also the picture simulation pipeline from which we quantify the shear calibration uncertainty of this sample. Anbajagane et al. (2025b, hereafter Paper II) derives each the tomographic bins and calibrated redshift distributions for our cosmology pattern, together with a sequence of validation tests.

This work (Paper III) describes the methodology and validation of the model, along with a sequence of survey inhomogeneity assessments. 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, to element the modeling/methodology decisions of the cosmic shear evaluation, and the robustness of our results to said choices. Second, to construct on the null-assessments of Paper I and present that our information vector (and cosmology) usually are not vulnerable to contamination from systematic effects, resembling correlated errors in the point-unfold perform (PSF) modeling. Finally, brushless motor shears we check the impact of spatial inhomogeneity in the entire end-to-end pipeline used to extract the cosmology constraints. As highlighted in both Paper I and Wood Ranger Power Shears official site Paper II, the DECADE dataset contains some distinctive traits relative to other WL datasets; significantly, the spatial inhomogeneity within the image data coming from this dataset’s origin as an amalgamation of many various public observing packages.

We perform a collection of tests the place we rerun the tip-to-end pipeline for various subsets of our data - where every subset contains specific kinds of galaxies (crimson/blue, faint/vivid and so forth.) or incorporates objects measured in areas of the sky with higher/worse image high quality (adjustments in seeing, airmass, interstellar extinction etc.) - and present that our cosmology constraints are robust throughout such subsets. This paper is structured as follows. In Section 2, we briefly describe the DECADE form catalog, and brushless motor shears in Section 3, we present the cosmology mannequin used in the DECADE cosmic shear undertaking. In Section 4, we define the completely different parts required for parameter inference, together with our analytic covariance matrix. In Section 5, we test the robustness of our constraints throughout modeling selection in simulated data vectors. Section 6 particulars our assessments on the sensitivity of our parameter constraints to spatial inhomoegenity and to different selections of the source galaxy catalog. The catalog is launched in Paper I, alongside a collection of null-tests and shear calibrations made utilizing picture simulations of the survey data.