The Extragalactic Distance Scale without Cepheids IV
Lachlan Hislop, Jeremy Mould, Brian Schmidt, Michael S. Bessell, Gary, Da Costa, Paul Francis, Stefan Keller, Patrick Tisserand, Sharon Rapoport,, and Andy Casey
TL;DR
This paper compares the TRGB and Cepheid distance scales using new observational data, finding them consistent, and calibrates the Tully-Fisher relation in the I band as an alternative to Cepheids for measuring extragalactic distances.
Contribution
It introduces a calibration of the Tully-Fisher relation using the TRGB distance scale with new SkyMapper data, providing an alternative to Cepheid-based measurements.
Findings
TRGB and Cepheid distance scales are consistent
Calibrated Tully-Fisher relation in the I band
Supports TRGB as a reliable alternative for distance measurement
Abstract
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.
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