Lensing Signals in the Hubble Ultra Deep Field Using All Second‐Order Shape Deformations | Zendy

John B. Irwin | Zendy; Marina Shmakova | Zendy; Jay Anderson | Zendy

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Lensing Signals in the Hubble Ultra Deep Field Using All Second‐Order Shape Deformations

Author(s) -

John B. Irwin,

Marina Shmakova,

Jay Anderson

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/522819

Subject(s) - physics , galaxy , astrophysics , weak gravitational lensing , radius , hubble deep field , observable , effective radius , hubble's law , astronomy , redshift , quantum mechanics , computer security , computer science

The long exposure times of the HST Ultra-Deep Field plus the use of anempirically derived position-dependent PSF, have enabled us to measure acardioid/displacement distortion map coefficient as well as improving upon thesextupole map coefficient. We confirmed that curved background galaxies areclumped on the same angular scale as found in the HST Deep Field North. The newcardioid/displacement map coefficient is strongly correlated to a product ofthe sextupole and quadrupole coefficients. One would expect to see such acorrelation from fits to background galaxies with quadrupole and sextupolemoments. Events that depart from this correlation are expected to arise frommap coefficient changes due to lensing, and several galaxy subsets selectedusing this criteria are indeed clumped.Comment: 9 pages, 16 figures, submitted to ApJ letter

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