The Carnegie-Chicago Hubble Program. IX. Calibration of the Tip of the Red Giant Branch Method in the Mega-Maser Host Galaxy, NGC4258 (M106)

In Sung Jang, Taylor Hoyt, Rachael Beaton +7

In the nearby galaxy NGC 4258, the well-modeled orbital motion of H${}_2$O masers about its supermassive black hole provides the means to measure a precise geometric distance. As a r…