167 citations · 703 across the 19 of their papers we have counts for
19 papers
Cosmic Gravitational Shear from the HST Medium Deep Survey
Stefano Casertano, Kavan U. Ratnatunga, Richard E. Griffiths
We present a measurement of cosmic shear on scales ranging from $ 10\arcsec $ to $ 2\arcmin $ in 347 WFPC2 images of random fields. Our result is based on shapes measured via image…
Investigation of Gravitational Lens Mass Models
Adam Knudson, Kavan U. Ratnatunga, Richard E. Griffith
We have previously reported the discovery of strong gravitational lensing by faint elliptical galaxies using the WFPC2 on HST and here we investigate their potential usefulness in…
Disk and Bulge Morphology of WFPC2 galaxies: The HST Medium Deep Survey database
Kavan U. Ratnatunga, Richard E. Griffiths, Eric J. Ostrander
Quantitative morphological and structural parameters are estimated for galaxies detected in HST observations of WFPC2 survey fields. A modeling approach based on maximum likelihood…
The Top Ten List of Gravitational Lens Candidates from the HST Medium Deep Survey
K. U. Ratnatunga, R. E. Griffiths, E. J. Ostrander
A total of 10 good candidates for gravitational lensing have been discovered in the WFPC2 images from the HST Medium Deep Survey (MDS) and archival primary observations. These cand…
The Morphologically Divided Redshift Distribution of Faint Galaxies
M. Im, R. E. Griffiths, A. Naim +4
We have constructed a morphologically divided redshift distribution of faint field galaxies using a statistically unbiased sample of 196 galaxies brighter than I = 21.5 for which d…
Compact Nuclei in Galaxies at Moderate Redshift:II. Their Nature and Implications for the AGN Luminosity Function
Vicki L. Sarajedini, Richard F. Green, Richard E. Griffiths +1
This study explores the space density and properties of active galaxies to z=0.8. We have investigated the frequency and nature of unresolved nuclei in galaxies at moderate redshif…