H0 revisited
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Open Access
- 19 March 2014
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 440 (2), 1138-1152
- https://doi.org/10.1093/mnras/stu278
Abstract
I reanalyse the Riess et al. (hereafter R11) Cepheid data using the revised geometric maser distance to NGC 4258 of Humphreys et al. (hereafter H13). I explore different outlier rejection criteria designed to give a reduced χ2 of unity and compare the results with the R11 rejection algorithm, which produces a reduced χ2 that is substantially less than unity and, in some cases, leads to underestimates of the errors on parameters. I show that there are sub-luminous low-metallicity Cepheids in the R11 sample that skew the global fits of the period–luminosity relation. This has a small but non-negligible impact on the global fits using NGC 4258 as a distance scale anchor, but adds a poorly constrained source of systematic error when using the Large Magellanic Cloud as an anchor. I also show that the small Milky Way Cepheid sample with accurate parallax measurements leads to a distance to NGC 4258 that is in tension with the maser distance. I conclude that H0 based on the NGC 4258 maser distance is H0 = 70.6 ± 3.3 km s−1 Mpc−1, compatible within 1σ with the recent determination from Planck for the base six-parameter Λ cold dark matter cosmology. If the H-band period–luminosity relation is assumed to be independent of metallicity and the three distance anchors are combined, I find H0 = 72.5 ± 2.5 km s−1 Mpc−1, which differs by 1.9σ from the Planck value. The differences between the Planck results and these estimates of H0 are not large enough to provide compelling evidence for new physics at this stage.Keywords
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This publication has 29 references indexed in Scilit:
- CONSTRAINTS ON COSMOLOGY FROM THE COSMIC MICROWAVE BACKGROUND POWER SPECTRUM OF THE 2500 deg2SPT-SZ SURVEYThe Astrophysical Journal, 2014
- NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTSThe Astrophysical Journal Supplement Series, 2013
- CARNEGIE HUBBLE PROGRAM: A MID-INFRARED CALIBRATION OF THE HUBBLE CONSTANTThe Astrophysical Journal, 2012
- COSMOGRAIL: the COSmological MOnitoring of GRAvItational LensesAstronomy & Astrophysics, 2011
- THE CARNEGIE HUBBLE PROGRAMThe Astronomical Journal, 2011
- TWO NEW TESTS OF THE METALLICITY SENSITIVITY OF THE CEPHEID PERIOD-LUMINOSITY RELATION (THE LEAVITT LAW)The Astrophysical Journal, 2011
- The Hubble ConstantAnnual Review of Astronomy and Astrophysics, 2010
- Fundamental Properties and Distances of the Large Magellanic Cloud from Eclipsing Binaries. II. HV 982The Astrophysical Journal, 2002
- Final Results from theHubble Space TelescopeKey Project to Measure the Hubble ConstantThe Astrophysical Journal, 2001
- A geometric distance to the galaxy NGC4258 from orbital motions in a nuclear gas diskNature, 1999