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Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant

  • Authors: Wendy L. Freedman, Barry F. Madore, Brad K. Gibson, Laura Ferrarese, Daniel D. Kelson, Shoko Sakai, Jeremy R. Mould, Robert C. Kennicutt, Jr., Holland C. Ford, John A. Graham, John P. Huchra, Shaun M. G. Hughes, Garth D. Illingworth, Lucas M. Macri, and Peter B. Stetson

Freedman et al. 2001 The Astrophysical Journal 553 47.

  • Provider: AAS Journals

Caption: Fig. 4.

Top: Hubble diagram of distance vs. velocity for secondary distance indicators calibrated by Cepheids. Velocities in this plot are corrected for the nearby flow model of Mould et al. (2000a). Squares: Type Ia supernovae; filled circles: Tully‐Fisher clusters (I‐band observations); triangles: fundamental plane clusters; diamonds: surface brightness fluctuation galaxies; open squares: Type II supernovae. A slope of ﹩H_{0}=72﹩ is shown, flanked by ±10% lines. Beyond 5000 km s−1 (vertical line), both numerical simulations and observations suggest that the effects of peculiar motions are small. The Type Ia supernovae extend to about 30,000 km s−1, and the Tully‐Fisher and fundamental plane clusters extend to velocities of about 9000 and 15,000 km s−1, respectively. However, the current limit for surface brightness fluctuations is about 5000 km s−1. Bottom: Value of H0 as a function of distance.

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