For Press coverage on the WFPC2 HST lens discoveries click.
Ratnatunga, K. U., Griffiths, R. E. & Ostrander, E. J. 1999,
The Top Ten List of Gravitational Lens Candidates from the HST Medium Deep Survey
Astronomical Journal 117 2010-2023 . astro-ph/9902100
The observed regions cutout from HST WFPC2 images are 64 pixels of of
the CCD or 6.4 arc seconds on a side.
All of the color images above were created using a fixed algorithm to transform the observed single filter F814W(R), F606W(G) and when available F450W(B) to color JPG. Although the color balance is probably not as pretty as images that may be created using interactive software procedures, these images can be inter-compared more realistically.
Note however that the color of the lensing galaxies are not yellow at the center but a bright red. The yellow produced by color saturation is used to indicate brightness to otherwise flat images.
To visualize gravitational lens configurations try out the interactive online WFPC2 HST lens image creator.
This cgi driver was written in FORTRAN back in 1999 at Carnegie Mellon University. After I retired back to Sri Lanka, virtual-universe.org was hosted at bluehost.com from 2006 July. After Bluehost stopped support of FORTRAN in 2019 October it was moved to a VPS on AWS, which was setup for me by Gayan Sirimana. It was recompiled using gfortran and activated on 2020 January 23rd. It is probably the only cgi written in FORTRAN
For more information on Gravitational lenses please also look at
Comments: E-mail firstname.lastname@example.org - Kavan's Home page.