249 citations · 3.4k across the 56 of their papers we have counts for
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Hubble Space Telescope Observations of White Dwarfs in the Globular Cluster M4
Harvey B. Richer, Gregory G. Fahlman, Rodrigo A. Ibata +9
With the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope, we have discovered in M4 (NGC 6121, C 1620-264) the first extensive sequence of cooling white dwarfs s…
The Dark Matter, Gas and Galaxy Distributions in Abell 2218: A Weak Gravitational Lensing and X-ray Analysis
G. Squires, N. Kaiser, A. Babul +4
We report on the detection of dark matter in the cluster Abell 2218 using the weak gravitational distortion of background galaxies. We find a highly significant, coherent detection…
Counting Pairs of Faint Galaxies
David Woods, Gregory G. Fahlman, Harvey B. Richer
The number of close pairs of galaxies observed to faint magnitude limits, when compared to nearby samples, determines the interaction or merger rate as a function of redshift. The…
The Double Cluster G185 in M31
Stephen Holland, Gregory G. Fahlman, Harvey B. Richer
We have identified a small globular cluster in M31 located approximately 4 arcseconds northwest of the M31 globular cluster G185. While several multiple globular clusters have been…