2020ApJ...905..104K

An independent determination of H₀ is crucial given the growing tension between the Hubble constant, H₀, derived locally and that determined from the modeling of the cosmic microwave background (CMB) originating in the early universe. In this work, we present a new determination of H₀ using velocities and tip of the red giant branch (TRGB) distances to 33 galaxies located between the Local Group and the Virgo cluster. We use a model of the infall pattern of the local Hubble flow modified by the Virgo mass, which is given as a function of the cosmological constants (H₀, Ω_Λ), the radius of the zero-velocity surface R₀, and the intrinsic velocity dispersion, σ_v. Fitting velocities and TRGB distances of 33 galaxies to the model, we obtain H₀ = 65.8 ± 3.5 (stat) ± 2.4 (sys) km s^–1 Mpc^–1 and R₀ = 6.76 ± 0.35 Mpc. Our local H₀ is consistent with the global H₀ determined from CMB radiation, showing no tension. In addition, we present new TRGB distances to NGC 4437 and NGC 4592, which are located near the zero-velocity surface: D = 9.28 ± 0.39 Mpc and D = 9.07 ± 0.27 Mpc, respectively. Their spatial separation is 0.29_–0.03^+0.30Mpc, suggesting that they form a physical pair.