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Title:
Hubble Space Telescope Observations of Globular Clusters in M87 and an Estimate of H 0
Authors:
WHITMORE, BRADLEY C.; SPARKS, WILLIAM B.; LUCAS, RAY A.; MACCHETTO, F. DUCCIO; BIRETTA, JOHN A.
Journal:
Astrophysical Journal Letters v.454, p.L73
Publication Date:
12/1995
Origin:
APJ; KNUDSEN
ApJ Keywords:
GALAXIES: STAR CLUSTERS, COSMOLOGY: DISTANCE SCALE, GALAXY: GLOBULAR CLUSTERS: GENERAL, GALAXIES: INDIVIDUAL MESSIER NUMBER: M87, GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4486
Abstract Copyright:
(c) 1995: The American Astronomical Society
Bibliographic Code:
1995ApJ...454L..73W

Abstract

Hubble Space Telescope observations of over 1000 globular clusters in the central region of M87 have been made using the Wide Field and Planetary Camera 2. The limiting magnitude in V is 26 mag, more than 2 mag beyond the turnover of the luminosity function. The distribution is well fitted by a Gaussian profile with a mean of <m^{0}_{V}> = 23.72 +/- 0.06 mag and a width of 1.40 +/- 0.06 mag. Assuming a value of <M^{0}_{V}> = -7.4 +/- 0.25 mag for the globular cluster luminosity function results in a distance modulus of (m - M) = 31.12 mag to the Virgo Cluster. Using a value of Delta Coma-Virgo(m - M) = 3.71 +/- 0.10 mag and adopting a velocity for the Coma Cluster of 7188 km s-1 result in a value for the Hubble constant of H0 = 78 +/- 11 km s-1 Mpc-1. The V - I color distribution is bimodal, with peaks at V - I = 0.95 mag and 1.20 mag. The mean size of the clusters is Reff = 3 pc, with a scatter of 1 pc.
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