A Cepheid Distance to the Fornax Cluster
Madore, B. F. · Freedman, W. L. · Silbermann, N. · Harding, P. · Huchra, J. · Mould, J. R. · Graham, J. A. · Ferrerase, L. · Gibson, B. K. · Han, M. · Hoessel, J. G. · Hughes, S. M. · Illingworth, G. D. · Phelps, R. · Sakai, S. · Stetson, P.
Original · EN
The Hubble Space Telescope is being used to measure accurate Cepheid distances to nearby galaxies with the ultimate aim of determining the Hubble constant, H₀. For the first time, it has become feasible to use Cepheid variables to derive a distance to a galaxy in the southern hemisphere cluster of Fornax. Based on the discovery of 37 Cepheids in the Fornax galaxy NGC 1365, a distance to this galaxy of 18.6 +/- 0.6 Mpc (statistical error only) is obtained. This distance leads to a value of H₀ = 70 +/- 7 (random) +/- 18 (systematic) km/sec/Mpc in good agreement with estimates of the Hubble constant further afield.
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