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A Measurement of the Cosmological Constant Using Elliptical Galaxies as Strong Gravitational Lenses
Myungshin Im, Richard E. Griffiths, Kavan U. Ratnatunga
We have identified seven (field) elliptical galaxies acting as strong gravitational lenses and have used them to measure cosmological parameters. To find the most likely value for…
Evidence for Galaxy Interactions/Mergers from Meduim-Deep Survey WFPC2 Data
L. W. Neuschaefer, M. Im, K. U. Ratnatunga +2
We examine the morphological and statistical properties of close galaxy pairs from two sets of 28 WFPC2 fields, acquired for the Medium Deep Survey (MDS) and the Groth/Westphal Sur…
Luminosity Functions of Elliptical Galaxies at z < 1.2
Myungshin Im, Richard E. Griffiths, Kavan U. Ratnatunga +1
The luminosity functions of E/S0 galaxies are constructed in 3 different redshift bins (0.2 < z < 0.55, 0.55 < z < 0.8, 0.8 < z < 1.2), using the data from the Hubble Space Telesco…