Lensing Signals in the Hubble Ultra-deep Field using all 2nd-order Shape Deformations

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The long exposure times of the HST Ultra-Deep Field plus the use of an empirically derived position-dependent PSF, have enabled us to measure a cardioid/displacement distortion map coefficient as well as improving upon the sextupole map coefficient. We confirmed that curved background galaxies are clumped on the same angular scale as found in the HST Deep Field North. The new cardioid/displacement map coefficient is strongly correlated to a product of the sextupole and quadrupole coefficients. One would expect to see such a correlation from fits to background galaxies with quadrupole and sextupole moments. Events that depart from this correlation are ... continued below

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9 pages

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Irwin, John; Shmakova, Marina; /SLAC; Anderson, Jay & U., /Rice July 17, 2006.

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Description

The long exposure times of the HST Ultra-Deep Field plus the use of an empirically derived position-dependent PSF, have enabled us to measure a cardioid/displacement distortion map coefficient as well as improving upon the sextupole map coefficient. We confirmed that curved background galaxies are clumped on the same angular scale as found in the HST Deep Field North. The new cardioid/displacement map coefficient is strongly correlated to a product of the sextupole and quadrupole coefficients. One would expect to see such a correlation from fits to background galaxies with quadrupole and sextupole moments. Events that depart from this correlation are expected to arise from map coefficient changes due to lensing, and several galaxy subsets selected using this criteria are indeed clumped.

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9 pages

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  • Report No.: SLAC-PUB-11940
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/887076 | External Link
  • Office of Scientific & Technical Information Report Number: 887076
  • Archival Resource Key: ark:/67531/metadc885454

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Creation Date

  • July 17, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 6:25 p.m.

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Irwin, John; Shmakova, Marina; /SLAC; Anderson, Jay & U., /Rice. Lensing Signals in the Hubble Ultra-deep Field using all 2nd-order Shape Deformations, report, July 17, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc885454/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.