39 citations · 55 across the 4 of their papers we have counts for
4 papers
Estimation of the Eclipse Solar Radius by Flash Spectrum Video Analysis
Luca Quaglia, John Irwin, Konstantinos Emmanouilidis +1
The value of the eclipse solar radius during the 2017 August 21 total solar eclipse was estimated to be at with no significant dependence on…
Lensing signals in the Hubble Ultra-Deep Field using all 2nd order shape deformations
John Irwin, Marina Shmakova, Jay Anderson
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…
Observation of small scale structure using sextupole lensing
John Irwin, Marina Shmakova
Weak gravitational lensing seeks to determine shear by measuring induced quadrupole (elliptical) shapes in background galaxy images. Small impact parameter (a few kpc) gravitationa…
Observations of cluster substructure using weakly lensed sextupole moments
John Irwin, Marina Shmakova
Since dark matter clusters and groups may have substructure, we have examined the sextupole content of Hubble images looking for a curvature signature in background galaxies that w…