The Extragalactic Distance Scale without Cepheids

Details The Extragalactic Distance Scale without Cepheids The Extragalactic Distance Scale without Cepheids

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...686l..75m&link_type=abstract

The Astrophysical Journal, Volume 686, Issue 2, pp. L75-L78.

Astronomy and Astrophysics

Astronomy

17

Cosmology: Distance Scale, Galaxies: Distances And Redshifts

Scientific paper

Distances of galaxies in the Hubble Space Telescope Key Project are based on the Cepheid period-luminosity relation. An alternative basis is the tip of the red giant branch. Using archival HST data, we calibrate the infrared Tully-Fisher relation using 14 galaxies with tip of the red giant branch measurements. Compared with the Key Project, a higher value of the Hubble constant by 10% +/- 7% is inferred. Within the errors the two distance scales are therefore consistent. We describe the additional data required for a conclusive tip of the red giant branch measurement of H0.

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