Metadetection Weak Lensing for the Vera C. Rubin Observatory

Autor:	Sheldon, Erin S., Becker, Matthew R., Jarvis, Michael, Armstrong, Robert, Collaboration, The LSST Dark Energy Science
Rok vydání:	2023
Předmět:	Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.21105/astro.2303.03947
Popis:	Forthcoming astronomical imaging surveys will use weak gravitational lensing shear as a primary probe to study dark energy, with accuracy requirements at the 0.1% level. We present an implementation of the Metadetection shear measurement algorithm for use with the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). This new code works with the data products produced by the LSST Science Pipelines, and uses the pipeline algorithms when possible. We tested the code using a new set of simulations designed to mimic LSST imaging data. The simulated images contained semi-realistic galaxies, stars with representative distributions of magnitudes and galactic spatial density, cosmic rays, bad CCD columns and spatially variable point spread functions. Bright stars were saturated and simulated ``bleed trails'' were drawn. Problem areas were interpolated, and the images were coadded into small cells, excluding images not fully covering the cell to guarantee a continuous point spread function. In all our tests the measured shear was accurate within the LSST requirements. Comment: 10 pages, 5 figures; minor text updates and additional references
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2303.03947 Zobrazit plný text záznamu View this record from Arxiv