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Surface brightness fluctuations (SBF) have been detected for three ellipticalgalaxies-NGC 3379 in the Leo group, NGC 4406 in the Virgo cluster, and NGC 4373in the Hydra-Centaurus supercluster-using marginally-sampled, deep images takenwith the Planetary Camera of the WFPC-2 instrument on the Hubble SpaceTelescope (HST). The power spectrum of the fluctuations image is well-fit by anempirical model of the point-spread function (PSF) constructed using pointsources identified in the field. The previous ground-based SBF measurements forNGC 3379 and NGC 4406 are recovered, thereby demonstrating the capability ofthe Planetary Camera of WFPC-2 to measure distances using the SBF techniquedespite the marginal sampling of the images. The residual variance due tounresolved sources in all three galaxies is only 2-5% of the detectedfluctuations signal, which confirms the advantage of HST imaging in minimizingthe uncertainty of this SBF correction. Extensive consistency checks, includingan independent SBF analysis using an alternate software package, suggest thatour internal uncertainties are < 0.02 mag. The fluctuations magnitude for NGC4373 is I814bar = 31.31 +/- 0.05 mag, corresponding to a distance modulus of DM= 32.99 +/- 0.11. This implies a peculiar velocity for this galaxy of 415 +/-330 km/s, which is smaller than derived from the D_n-sigma relation. Theseresults demonstrate the power of the post-repair HST to measure distances toelliptical galaxies at significant redshifts using the SBF technique.Comment: to appear in The Astrophysical Journal; 25 pages, including 7  Postscript figures and 2 tables; uses AAS LaTeX style file

Detection of Surface Brightness Fluctuations in NGC 4373 Using theHubble Space Telescope