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The TRGB-SBF Project. III. Refining the HST Surface Brightness Fluctuation Distance Scale Calibration with JWST

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arxiv 2502.15935 v2 pith:HRRUFFXD submitted 2025-02-21 astro-ph.CO

Joseph B. Jensen , John P. Blakeslee , Michele Cantiello , Mikaela Cowles , Gagandeep S. Anand , R. Brent Tully , Ehsan Kourkchi , Gabriella Raimondo This is my paper · ORCID
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keywords calibrationdistanceprojectbrightnessconstantfluctuationindependentjwst
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abstract

The TRGB-SBF Project team is developing an independent distance ladder using a geometrical calibration of the tip of the red giant branch (TRGB) method in elliptical galaxies that can in turn be used to set the surface brightness fluctuation (SBF) distance scale independent of Cepheid variables and Type~Ia supernovae (SNe Ia). The purpose of this project is to measure the local expansion rate of the universe independently of the methods that are most at odds with the theoretically-predicted value of the Hubble-Lema\^itre constant $H_0$, and therefore isolate the influence of potential systematic observational errors. In this paper, we use JWST TRGB distances calibrated using the megamaser galaxy NGC 4258 to determine a new Cepheid-independent SBF zero point for HST. This new calibration, along with improved optical color measurements from PanSTARRS and DECam, gives an updated value of $H_0 = 73.8\pm 0.7$ (statistical) $\pm 2.3$~(systematic) km/s/Mpc that is virtually identical to the SBF Hubble constant measured by Blakeslee et al. 2021.

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Cited by 3 Pith papers

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

  1. Two per cent measurement of $H_0$ from Cepheids alone

    astro-ph.CO 2025-09 conditional novelty 7.0 of 10

    A Cepheid-only distance ladder with rigorous selection modelling and BORG-based peculiar velocities yields H0 = 71.7 +/- 1.3 km/s/Mpc, in mild tension with SH0ES and in ~3 sigma tension with Planck.

  2. 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.

  3. Looking beyond lambda

    astro-ph.CO 2025-08 unverdicted novelty 2.0 of 10

    A perspective piece argues that LambdaCDM is showing cracks and that cosmologists should prepare for a beyond-LambdaCDM era with more complex dark energy models.

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