The DECADE Cosmic Shear Project III: Validation Of Analysis Pipeline Utilizing Spatially Inhomogeneous Data
We present the pipeline for the cosmic shear evaluation 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 a lot of disparate observing applications and is subsequently more inhomogeneous throughout the sky in comparison with present lensing surveys. First, we use simulated data-vectors to point out the sensitivity of our constraints to totally different analysis decisions 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 data and is carried out in a completely constant manner: for each subset of the information, we re-derive the photometric redshift estimates, shear calibrations, survey switch functions, the data vector, measurement covariance, and at last, the cosmological constraints. Our outcomes present that current evaluation methods for weak lensing cosmology may be pretty resilient in the direction of inhomogeneous datasets.
This also motivates exploring a wider range of picture knowledge for pursuing such cosmological constraints. Over the past two decades, weak gravitational lensing (also 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 subtle bending of gentle from distant "source galaxies" as a consequence of the large-scale matter distribution between the supply and the observer (Bartelmann & Schneider 2001). Thus, weak lensing, through its sensitivity to the matter distribution, probes the large-scale structure (LSS) of our Universe and any processes that influence this structure; together with cosmological processes such as modified gravity (e.g., Schmidt 2008) and primordial signatures (e.g., buy Wood Ranger Power Shears Wood Ranger Power Shears USA Wood Ranger Power Shears price Wood Ranger Power Shears shop manual Anbajagane et al. 2024c; Goldstein et al. 2024), in addition to 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 panorama of cosmological probes, the primary of which is that it's an unbiased tracer of the density discipline - not like other tracers, corresponding to galaxies - and does not require modeling or marginalizing over an related bias parameter (Bartelmann & Schneider 2001). For these causes, it is among the main probes of cosmology and has delivered a few of our best constraints on cosmological parameters. This paper is part of a series 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 ultimate cosmology pattern, the robustness assessments, and Wood Ranger Power Shears order now 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 calibrated redshift distributions for our cosmology pattern, together with a sequence of validation exams.
This work (Paper III) describes the methodology and validation of the mannequin, along with a series 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 purposes. First, to detail the modeling/methodology decisions of the cosmic shear evaluation, and the robustness of our outcomes to stated selections. Second, Wood Ranger Power Shears warranty shears to build on the null-exams of Paper I and show that our information vector (and cosmology) aren't prone to contamination from systematic effects, comparable to correlated errors in the point-unfold operate (PSF) modeling. Finally, we take a look at the impression of spatial inhomogeneity in your entire finish-to-end pipeline used to extract the cosmology constraints. As highlighted in both Paper I and Paper II, the DECADE dataset comprises some unique traits relative to other WL datasets; notably, the spatial inhomogeneity in the image data coming from this dataset’s origin as an amalgamation of many different public observing programs.
We carry out a set of assessments the place we rerun the top-to-finish pipeline for different subsets of our knowledge - where every subset contains particular sorts of galaxies (red/blue, faint/brilliant etc.) or incorporates objects measured in regions of the sky with higher/worse picture high quality (modifications in seeing, airmass, interstellar extinction and so on.) - and 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 current the cosmology model used in the DECADE cosmic shear undertaking. In Section 4, we outline the different components required for parameter inference, Wood Ranger Power Shears order now together with our analytic covariance matrix. In Section 5, we verify the robustness of our constraints across modeling selection in simulated information vectors. Section 6 particulars our exams on the sensitivity of our parameter constraints to spatial inhomoegenity and to different selections of the supply galaxy catalog. The catalog is launched in Paper I, alongside a collection of null-assessments and shear calibrations made using picture simulations of the survey information.