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- W3033205383 abstract "ABSTRACT Galaxy–galaxy lensing is an essential tool for probing dark matter haloes and constraining cosmological parameters. While galaxy–galaxy lensing measurements usually rely on shear, weak-lensing magnification contains additional constraining information. Using the Fundamental Plane (FP) of elliptical galaxies to anchor the size distribution of a background population is one method that has been proposed for performing a magnification measurement. We present a formalism for using the FP residuals of elliptical galaxies to jointly estimate the foreground mass and background redshift errors for a stacked lens scenario. The FP residuals include information about weak-lensing magnification κ, and therefore foreground mass, since to first order, non-zero κ affects galaxy size but not other FP properties. We also present a modular, extensible code that implements the formalism using emulated galaxy catalogues of a photometric galaxy survey. We find that combining FP information with observed number counts of the source galaxies constrains mass and photo-z error parameters significantly better than an estimator that includes number counts only. In particular, the constraint on the mass is 17.0 per cent if FP residuals are included, as opposed to 27.7 per cent when only number counts are included. The effective size noise for a foreground lens of mass $M_mathrm{ H}=10^{14}, mathrm{M}_odot$, with a conservative selection function in size and surface brightness applied to the source population, is σκ, eff = 0.250. We discuss the improvements to our FP model necessary to make this formalism a practical companion to shear analyses in weak-lensing surveys." @default.
- W3033205383 created "2020-06-12" @default.
- W3033205383 creator A5033796141 @default.
- W3033205383 creator A5056599488 @default.
- W3033205383 creator A5061470538 @default.
- W3033205383 date "2020-06-04" @default.
- W3033205383 modified "2023-10-01" @default.
- W3033205383 title "A framework for measuring weak-lensing magnification using the Fundamental Plane" @default.
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- W3033205383 doi "https://doi.org/10.1093/mnras/staa1505" @default.
- W3033205383 hasPublicationYear "2020" @default.
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