Lensing Signals in the Hubble Ultra-Deep Field Using All 2nd-Order Shape Deformations.
(05/01/2014)
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 coe-cient as well as improving upon the sextupole map coe-cient. We conrmed 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 production of the sextupole and quadrupole coe-cients. One would expect to see such a cor relation from ts to background galaxies with quadrupole and sextupole moments. Events that depart from this correlation...
Tác giả: Irwin, J.; Shmakova, M.; Anderson, J. |
Số trang: 10 |
Lĩnh vực: Vũ trụ |
Năm XB: 2006 |
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Lensing Signals in the Hubble Ultra-Deep Field Using All 2nd-Order Shape Deformations. | Số trang: 10
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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 coe-cient as well as improving upon the sextupole map coe-cient. We conrmed 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 production of the sextupole and quadrupole coe-cients. One would expect to see such a cor relation from ts 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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