Connecting Infrared Surface Brightness Fluctuation Distances to Type Ia Supernova Hosts: Testing the Top Rung of the Distance Ladder

We compare infrared surface brightness fluctuation (IR SBF) distances measured in galaxies that have hosted type Ia supernovae (SNIa) to estimated from SNIa light curve fits. show the properties of found IR SBF hosts are very different those exploding Cepheid calibrators, therefore, this is a direct test systematic uncertainties on estimation Hubble constant (Ho) using supernovae. The results Jensen et al. (2021; arXiv:2105.08299) provide large and uniformly sample which we directly with 25 host galaxies. divide flow into sub-samples best match divergent supernova seen hosts. further widths masses congruent SBF-calibrated refit stretch color correlations luminosity, use these revised parameters calibrate calibrators. Relative flow, average calibrator distance moduli vary by 0.03mag depending subsamples examined adds 1.8% uncertainty our estimate. Based Ho=74.6$\pm$0.9(stat)$\pm$ 2.7(syst) km/s/Mpc, consistent derived calibrated variables. conclude provides reliable calibration precision comparable significant saving telescope time.