Final Results from theHubble Space TelescopeKey Project to Measure the Hubble Constant

2000/12/18 by Wendy L. Freedman, W. L. Freedman, Barry F. Madore +27 · 28 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.1086/320638

published as Astrophys.J.553:47-72,2001 · Accepted to the Astrophysical Journal, 10 figures

arxiv created 2000/12/18 · openalex publication_date 2001/05/20 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

We present here the final results of the Hubble Space Telescope ( HST ) Key Project to measure the Hubble constant. We summarize our method, the results, and the uncertainties, tabulate our revised distances, and give the implications of these results for cosmology. Our results are based on a Cepheid calibration of several secondary distance methods applied over the range of about 60-400 Mpc. The analysis presented here benefits from a number of recent improvements and refinements, including (1) a larger LMC Cepheid sample to define the fiducial period-luminosity (PL) relations, (2) a more recent HST Wide Field and Planetary Camera 2 (WFPC2) photometric calibration, (3) a correction for Cepheid metallicity, and (4) a correction for incompleteness bias in the observed Cepheid PL samples. We adopt a distance modulus to the LMC (relative to which the more distant galaxies are measured) of μ 0 = 18.50 ± 0.10 mag, or 50 kpc. New, revised distances are given for the 18 spiral galaxies for which Cepheids have been discovered as part of the Key Project, as well as for 13 additional galaxies with published Cepheid data. The new calibration results in a Cepheid distance to NGC 4258 in better agreement with the maser distance to this galaxy. Based on these revised Cepheid distances, we find values (in km s -1 Mpc -1 ) of H 0 = 71 ± 2 ± 6 (systematic) (Type Ia supernovae), H 0 = 71 ± 3 ± 7 (Tully-Fisher relation), H 0 = 70 ± 5 ± 6 (surface brightness fluctuations), H 0 = 72 ± 9 ± 7 (Type II supernovae), and H 0 = 82 ± 6 ± 9 (fundamental plane). We combine these results for the different methods with three different weighting schemes, and find good agreement and consistency with H 0 = 72 ± 8 km s -1 Mpc -1 . Finally, we compare these results with other, global methods for measuring H 0 .

Citations

• Pixelated Lenses and [ITAL]H[/ITAL][TINF]0[/TINF] from Time-Delay Quasars
• First Estimations of Cosmological Parameters From BOOMERANG
• Values of [ITAL]H[/ITAL][TINF]0[/TINF] from Models of the Gravitational Lens 0957+561
• A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk
• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• The Motions of Clusters of Galaxies and the Dipoles of the Peculiar Velocity Field
• Implications of Cosmic Microwave Background Anisotropies for Large‐Scale Variations in Hubble's Constant
• An Infrared Einstein Ring in the Gravitational Lens PG 1115+080
• Velocity dispersions and mass-to-light ratios for elliptical galaxies
• A relation between distance and radial velocity among extra-galactic nebulae
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• A flat Universe from high-resolution maps of the cosmic microwave background radiation
• The Sunyaev–Zel'dovich effect
• The Quadruple Gravitational Lens PG 1115+080: Time Delays and Models

Cited by

• Determination of the Hubble Constant Using Cepheids
• Hubble's diagram and cosmic expansion
• The cosmological density of baryons from observations of 3He+ in the Milky Way
• Measuring our universe from galaxy redshift surveys
• Tracing cosmic evolution with clusters of galaxies
• The Colors of Dwarf Elliptical Galaxy Globular Cluster Systems, Nuclei, and Stellar Halos
• Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations
• Cosmicflows-2: The Data
• Age Estimates of Globular Clusters in the Milky Way: Constraints on Cosmology
• The interstellar environment of our galaxy
• The Extinction and Distance of Maffei 2 and a New View of the IC 342/Maffei Group
• The neutrino mass bound from WMAP 3 year data, the baryon acoustic peak, the SNLS supernovae and the Lyman-α forest
• THE BARYON CONTENT OF COSMIC STRUCTURES
• A SPECTROSCOPIC AND PHOTOMETRIC SURVEY OF NOVAE IN M31
• THE GALACTIC NOVA RATE REVISITED
• The ACS Virgo Cluster Survey. XIII. SBF Distance Catalog and the Three‐dimensional Structure of the Virgo Cluster
• New constraints on cosmological parameters and neutrino properties using the expansion rate of the Universe toz∼ 1.75
• The Tully-Fisher Relation and its Residuals for a Broadly Selected Sample of Galaxies
• Cosmic dynamics in the era of Extremely Large Telescopes
• Halting eternal acceleration with an effective negative cosmological constant
• Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope
• A new search for features in the primordial power spectrum
• WMAP constraints on inflationary models with global defects
• DO WE HAVE EVIDENCE FOR NEW PHYSICS IN THE SKY?
• Spitzer Spectroscopy of Dusty Disks around B[e] Hypergiants in the Large Magellanic Cloud
• An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent
• Edwin Hubble [wikipedia]
• Hubble Space Telescope [wikipedia]