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The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints

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arxiv 2001.09213 v2 pith:VRKEXGDL submitted 2020-01-24 astro-ph.CO astro-ph.GA

D. W. Pesce , J. A. Braatz , M. J. Reid , A. G. Riess , D. Scolnic , J. J. Condon , F. Gao , C. Henkel
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C. M. V. Impellizzeri C. Y. Kuo K. Y. Lo
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keywords distanceconstanthubblepeculiargalaxiesmeasurementsvaluevelocity
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abstract

We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser data and obtained better distance estimates for four galaxies previously published by the Megamaser Cosmology Project: UGC 3789, NGC 6264, NGC 6323, and NGC 5765b. Combining these updated distance measurements with those for the maser galaxies CGCG 074-064 and NGC 4258, and assuming a fixed velocity uncertainty of 250 km s$^{-1}$ associated with peculiar motions, we constrain the Hubble constant to be $H_0 = 73.9 \pm 3.0$ km s$^{-1}$ Mpc$^{-1}$ independent of distance ladders and the cosmic microwave background. This best value relies solely on maser-based distance and velocity measurements, and it does not use any peculiar velocity corrections. Different approaches for correcting peculiar velocities do not modify $H_0$ by more than ${\pm}1{\sigma}$, with the full range of best-fit Hubble constant values spanning 71.8-76.9 km s$^{-1}$ Mpc$^{-1}$. We corroborate prior indications that the local value of $H_0$ exceeds the early-Universe value, with a confidence level varying from 95-99% for different treatments of the peculiar velocities.

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Cited by 9 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Reanalyzing Megamasers: a low value of $H_0$ from a local probe changes our view of the Hubble Tension

    astro-ph.CO 2026-08 conditional novelty 6.0 of 10

    Reanalyzing six megamaser galaxies with the M25 peculiar velocity reconstruction yields H0 ≈ 68.7 km/s/Mpc, consistent with the CMB and about 2.2σ below the local distance ladder.

  2. Little ado about everything II: an `emergent' dark energy from structure formation to rule cosmic tensions

    astro-ph.CO 2025-02 conditional novelty 5.0 of 10

    An ensemble-averaged stochastic cosmology with a 'little ado' noise term produces an emergent dark energy that fits late-time data and claims to relieve the H0 and f sigma8 tensions.

  3. Updated 1.1% Precision Values of the Hubble Constant with Corrected Pantheon+ and Dark Energy Survey (DES)-DOVEKIE Type Ia Supernovae

    astro-ph.CO 2026-07 accept novelty 4.0 of 10

    Corrected Pantheon+ and DES-DOVEKIE leave H0DN at H0≈73.1–73.3 km s⁻¹ Mpc⁻¹ (main baseline 73.264±0.806), so the ~6.4–6.85σ tension with CMB+ΛCDM remains.

  4. Hubble tension: a short review of theoretical explanations

    astro-ph.CO 2026-07 accept novelty 4.0 of 10

    A comprehensive review finds no theoretical Hubble-tension solution yet passes all consistency tests; new early-dark-energy chains reach high H0 only when the SH0ES calibration is added.

  5. Late-time cosmological constraints on three holographic dark energy models with DESI DR2 BAO and Type Ia supernovae

    physics.gen-ph 2026-07 accept novelty 4.0 of 10

    DESI DR2 and late-time data constrain HDE, ADE and RDE, yielding H0≈67–68 km/s/Mpc, c≈1, n≈2.8, γ≈0.54, with none resolving the Hubble tension or decisively beating ΛCDM.

  6. Crosschecking Cosmic Distances from DESI BAO and DES SNe

    astro-ph.CO 2025-10 conditional novelty 4.0 of 10

    For DESI DR2 BAO versus DES SNe, the comoving-distance ratio is flat but the inverse-Hubble-distance ratio falls with redshift at 2.3–2.5σ, which the authors attribute to systematics.

  7. Constraints on Dark Energy Models Using Late Universe Probes

    astro-ph.CO 2025-06 conditional novelty 4.0 of 10

    Using late-universe probes only, the authors find all dark energy models remain within 1-2 sigma of Lambda CDM, which wins the Bayesian model comparison, and confirm that DESI's LRG1 and LRG2 points drive the dynamica...

  8. The Hubble tension: A decade review

    astro-ph.CO 2026-06 unverdicted novelty 3.0 of 10

    Pure early or late fixes to the Hubble tension are tightly constrained; remaining options are combined early-late interacting dark energy or new physics at the local-to-homogeneous transition.

  9. Interacting Early Dark Energy

    gr-qc 2025-02 reject novelty 3.0 of 10

    The paper derives a modified radiation scaling and a decaying field-to-radiation ratio for an exponentially coupled scalar, but the claimed cosmological constant behavior and data agreement are not supported.

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