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The Crowded Cosmos: Effects of Blended Galaxies on Cosmic Shear

20 Mar 2021, 14:34 UTC
The Crowded Cosmos: Effects of Blended Galaxies on Cosmic Shear
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Title: Effects of overlapping sources on cosmic shear estimation: Statistical sensitivity and pixel-noise biasAuthors: Javier Sanchez, Ismael Mendoza, David P. Kirkby, and Patricia R. Burchat for the LSST Dark Energy Science CollaborationFirst Author’s Institution: Fermi National Accelerator Laboratory, Batavia IL 60510, USAStatus: Submitted to JCAP [closed access]The next generation of astronomical surveys are going to be some of the most powerful and extensive probes of dark energy ever made, and the Vera Rubin Observatory’s (VRO) Legacy Survey of Space and Time (LSST) is no exception. With an 8.4 meter mirror and 3.2 gigapixel camera, it’s set to take about 800 images per night covering 10 square degrees every 30 seconds. With the survey’s amazing coverage and depth, it will capture images of many galaxies and clusters that can help us demystify the cosmological structure of the universe.
Short Detours on the Cosmic HighwayOne of the major probes of dark energy that nature provides us with is weak gravitational lensing. Gravitational lensing is an effect caused by the bending of spacetime around massive clusters, distorting and bending the light from background objects. Depending on the geometry and mass distribution of the lens and source, sometimes this can cause intense distortions of ...

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