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Dan Scolnic

Dan Scolnic

I will present recent results from a full re-analysis of TRGB measurements in the first and second rung of the distance ladder.  I will show how the tip brightness varies across fields of the galaxies, and present a 5sigma relation between the tip brightness and the measured contrast ratio.  I will show how this relation can be used to ’standardize’ TRGB measurements, reaching a state-of-the-art dispersion across fields.  I will then talk about how we combine measurements of the TRGB in NGC 4258 with measurements in supernova hosts, and combine this with Pantheon+.  I will discuss how the resulting value is consistent with the SH0ES value of the Hubble constant, and this is partly due to the homogenous treatment of TRGB, as well as the usage of the Pantheon+ supernova catalog.  Finally, I will place this result in the context of other H0 measurements.