Determination of the Local Hubble Constant from Virgo Infall Using TRGB Distances

Yoo Jung Kim; Jisu Kang; Myung Gyoon Lee; In Sung Jang

doi:10.3847/1538-4357/abbd97

paper

Determination of the Local Hubble Constant from Virgo Infall Using TRGB Distances

arXiv:2010.01364 · doi:10.3847/1538-4357/abbd97

Abstract

An independent determination of $H_{0}$ is crucial given the growing tension between the Hubble constant, $H_{0}$ , 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 $H_{0}$ 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 ( $H_{0}$ , $Ω_{Λ}$ ), the radius of the zero-velocity surface $R_{0}$ , and the intrinsic velocity dispersion, $σ_{v}$ . Fitting velocities and TRGB distances of 33 galaxies to the model, we obtain $H_{0} =$ 65.8 $\pm$ 3.5( $s t a t$ ) $\pm$ 2.4( $sy s$ ) km s $^{- 1}$ Mpc $^{- 1}$ and $R_{0} =$ 6.76 $\pm$ 0.35 Mpc. Our local $H_{0}$ is consistent with the global $H_{0}$ 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 $\pm$ 0.39 Mpc and D = 9.07 $\pm$ 0.27 Mpc, respectively. Their spatial separation is 0.29 $_{- 0.03}^{+ 0.30}$ Mpc, suggesting that they form a physical pair.

arXiv commentAccepted for publication in ApJ, 18 pages, 9 figures, 6 tables

Determination of the Local Hubble Constant from Virgo Infall Using TRGB Distances

Abstract

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