Distance to the Virgo Cluster Galaxy M100 from Hubble Space Telescope Observations of Cepheids

Wendy L. Freedman, Barry F. Madore, Jeremy R. Mould, Robert Hill, Laura Ferrarese, Robert C. Kennicutt, Jr., Abhijit Saha, Peter B. Stetson, John A. Graham, Holland Ford, John G. Hoessel, John Huchra, Shaun M. Hughes, & Garth D. Illingworth


Accurate distances to galaxies are critical for determining the present expansion rate of the Universe of Hubble constant (H0). An important step in resolving the current uncertainty in H0 is the measurement of the distance to the Virgo cluster of galaxies. New observations using the Hubble Space Telescope yield a distance of 17.1 +/- 1.8 Mpc. to the Virgo cluster galaxy M100. This distance leads to a value of H0 = 80 +/- 17 km/s/Mpc A comparable value of H0 is also derived from the Coma cluster using independent estimates of its distance ratio relative to the Virgo cluster.

Nature, Vol. 371, October 27, 1994, page 757.

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