Metallicity-Corrected Tip of the Red Giant Branch Distances to Galaxies

Details Metallicity-Corrected Tip of the Red Giant Branch Distances to Galaxies Metallicity-Corrected Tip of the Red Giant Branch Distances to Galaxies

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344408m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #444.08; Bulletin of the American Astronomical Society, Vol. 41, p.327

Astronomy and Astrophysics

Astronomy

Scientific paper

Here we present a method for finding the distance to galaxies using the tip of the red giant branch (TRGB) that incorporates a novel approach to fully account for metallicity effects. We have used this method to determine the most precise TRGB distance moduli to date for NGC 4258, NGC 3368, NGC 3627, M83, and the Antennae galaxy, using observations made with the Hubble Space Telescope (HST) and the Wide Field, Advanced Camera for Surveys (ACS/WFC). NGC4258 is unique in that it has a Keplerian-rotating disk of water masers with proper motions and radial velocities that can be cross-compared and modeled with essentially one additional free parameter: the distance. The distance we obtained for NGC 4258 with our TRGB method is in excellent agreement with this water maser distance.

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