The Hubble Tension Revisited: Additional Local Distance Ladder Uncertainties

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jats:titleAbstract</jats:title> jats:pIn a recent paper, we investigated possible systematic uncertainties related to the Cepheid color–luminosity calibration method and their influence on the tension between the Hubble constant as inferred from distances to Type Ia supernovae and the cosmic microwave background as measured with the Planck satellite. Here, we study the impact of other sources of uncertainty in the supernova distance ladder, including Cepheid temperature and metallicity variations, supernova magnitudes, and GAIA parallax distances. Using Cepheid data in 19 Type Ia supernova host galaxies from Riess et al., anchor data from Riess et al., and a set of recalibrated Milky Way Cepheid distances, we obtain jats:italicH</jats:italic> jats:sub0</jats:sub> = 71.9 ± 2.2 km sjats:sup−1</jats:sup> Mpcjats:sup−1</jats:sup>, 2.0jats:italicσ</jats:italic> from the Planck value. Excluding Cepheids with estimated color excesses jats:inline-formula jats:tex-math

</jats:tex-math> <mml:math xmlns:mml="" overflow="scroll"> <mml:mover accent="true"> mml:mrow mml:miE</mml:mi> </mml:mrow> mml:mrow mml:moˆ</mml:mo> </mml:mrow> </mml:mover> <mml:mo stretchy="false">(</mml:mo> mml:miV</mml:mi> mml:mo−</mml:mo> mml:miI</mml:mi> <mml:mo stretchy="false">)</mml:mo> mml:mo=</mml:mo> mml:mn0.15</mml:mn> </mml:math> <jats:inline-graphic xmlns:xlink="" xlink:href="apjac7c19ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> mag to mitigate the impact of the Cepheid color–luminosity calibration, the inferred Hubble constant is jats:italicH</jats:italic> jats:sub0</jats:sub> = 68.1 ± 2.6 km sjats:sup−1</jats:sup> Mpcjats:sup−1</jats:sup>, removing the tension with the Planck value.</jats:p>

5109 Space Sciences, 51 Physical Sciences
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American Astronomical Society