The Cepheid period-luminosity relation is the primary distance indicator used in most determinations of the Hubble constant. The tip of the red giant branch (TRGB) is an alternative basis. Using the new ANU SkyMapper Telescope, we calibrate the Tully Fisher relation in the I band. We find that the TRGB and Cepheid distance scales are consistent.
@article{arxiv.1104.0974,
title = {The Extragalactic Distance Scale without Cepheids IV},
author = {Lachlan Hislop and Jeremy Mould and Brian Schmidt and Michael S. Bessell and Gary Da Costa and Paul Francis and Stefan Keller and Patrick Tisserand and Sharon Rapoport and Andy Casey},
journal= {arXiv preprint arXiv:1104.0974},
year = {2015}
}