2024/03/11 by Balakrishna S. Haridasu, P. Salucci, Haridasu, Balakrishna S. +3
Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
paper · pdf · doi:10.48550/arxiv.2403.06859
openalex publication_date 2024/03/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Utilizing the well-established Radial Tully-Fisher (RTF) relation observed in a `large' (843) sample of local galaxies, we report the maximum allowed variance in the Hubble parameter, H0. We estimate the total intrinsic scatter in the magnitude of the RTF relation(s) implementing a cosmological model-independent cosmographic expansion. We find that the maximum allowed local variation in our baseline analysis, using 4 RTF relations in the galaxy sample is ΔH0/H0 \lesssim 3 % at a 95% C.L. significance. Which is implied form a constraint of ΔH0/H0 = 0.54+1.32-1.37 % estimated at D_\rmL∼ 10 [\rmMpc]. Using only one `best-constrained' radial bin we report a conservative 95% C.L. limit of ΔH0/H0 \lesssim 4 %. Through our estimate of maximum variation, we propose a novel method to validate several late-time/local modifications put forth to alleviate the H0 tension. We find that within the range of the current galaxy sample redshift distribution 10 [\rmMpc] ≤ D_\rmL ≤ 140 [\rmMpc], it is highly unlikely to obtain a variation of ΔH0/H0 ∼ 9%, necessary to alleviate the H0-tension. However, we also elaborate on the possible alternative inferences when the innermost radial bin is included in the analysis. Alongside the primary analysis of fitting the individual RTF relations independently, we propose and perform a joint analysis of the RTF relations useful to create a pseudo-standardizable sample of galaxies. We also test for the spatial variation of H0, finding that the current samples' galaxies distributed only in the southern hemisphere support the null hypothesis of isotropy, within the allowed noise levels.