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Title:
The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XXVI. The Calibration of Population II Secondary Distance Indicators and the Value of the Hubble Constant
Authors:
Ferrarese, Laura; Mould, Jeremy R.; Kennicutt, Robert C., Jr.; Huchra, John; Ford, Holland C.; Freedman, Wendy L.; Stetson, Peter B.; Madore, Barry F.; Sakai, Shoko; Gibson, Brad K.; Graham, John A.; Hughes, Shaun M.; Illingworth, Garth D.; Kelson, Daniel D.; Macri, Lucas; Sebo, Kim; Silbermann, N. A.
Affiliation:
AA(Hubble Fellow.; California Institute of Technology, Pasadena, CA 91125), AB(Research School of Astronomy and Astrophysics, Institute of Advanced Studies, Australian National University, ACT 2611, Australia), AC(Steward Observatory, The University of Arizona, Tucson, AZ 85721), AD(Harvard Smithsonian Center for Astrophysics, Cambridge MA, 02138), AE(Johns Hopkins University and Space Telescope Science Institute, Baltimore, MD 21218), AF(Carnegie Observatories, Pasadena, CA 91101), AG(Dominion Astrophysical Observatory, Victoria, British Columbia V8X 4M6, Canada), AH(NASA/IPAC Extragalactic Database and California Institute of Technology, Pasadena, CA 91125), AI(Kitt Peak National Observatory, NOAO, Tucson, AZ 85726), AJ(Center for Astrophysics and Space Astronomy (CASA), Campus Box 389, University of Colorado, Boulder, CO 80309), AK(Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015), AL(Royal Greenwich Observatory, Cambridge CB3 OHA, UK), AM(Lick Observatory, University of California, Santa Cruz, CA 95064), AN(Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015), AO(Harvard Smithsonian Center for Astrophysics, Cambridge MA, 02138), AP(Research School of Astronomy and Astrophysics, Institute of Advanced Studies, Australian National University, ACT 2611, Australia), AQ(NASA/IPAC Extragalactic Database and California Institute of Technology, Pasadena, CA 91125)
Publication:
The Astrophysical Journal, Volume 529, Issue 2, pp. 745-767. (ApJ Homepage)
Publication Date:
02/2000
Origin:
UCP
ApJ Keywords:
SUBJECT HEADINGS: STARS: VARIABLES: CEPHEIDS, COSMOLOGY: DISTANCE SCALE, GALAXIES: STAR CLUSTERS, STARS: LATE-TYPE
DOI:
10.1086/308309
Bibliographic Code:
2000ApJ...529..745F

Abstract

A Cepheid-based calibration is derived for four distance indicators that utilize stars in old stellar populations: the tip of the red giant branch (TRGB), the planetary nebula luminosity function (PNLF), the globular cluster luminosity function (GCLF), and the surface brightness fluctuation method (SBF). The calibration is largely based on the Cepheid distances to 18 spiral galaxies within cz=1500 km s-1 obtained as part of the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale, but relies also on Cepheid distances from separate HST and ground-based efforts. The newly derived calibration of the SBF method is applied to obtain distances to four Abell clusters in the velocity range 3800-5000 km s-1. Combined with cluster velocities corrected for a cosmological flow model, these distances imply a value of the Hubble constant of H0=69+/-4 (random)+/-6 (systematic) km s-1 Mpc-1. This result assumes that the Cepheid PL relation is independent of the metallicity of the variable stars; adopting a metallicity correction as in Kennicutt et al. would produce a 5%+/-3% decrease in H0. Finally, the newly derived calibration allows us to investigate systematics in the Cepheid, PNLF, SBF, GCLF, and TRGB distance scales.

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