The Carnegie-Chicago Hubble Program. VIII. An Independent Determination of the Hubble Constant Based on the Tip of the Red Giant Branch

@article{Freedman2019TheCH,
  title={The Carnegie-Chicago Hubble Program. VIII. An Independent Determination of the Hubble Constant Based on the Tip of the Red Giant Branch},
  author={Wendy L. Freedman and Barry F. Madore and Dylan Hatt and Taylor J. Hoyt and In Sung Jang and Rachael L. Beaton and Christopher R. Burns and Myung Gyoon Lee and Andrew J. Monson and Jillian R. Neeley and Mark M. Phillips and Jeffrey A. Rich and Mark Seibert},
  journal={The Astrophysical Journal},
  year={2019}
}
We present a new and independent determination of the local value of the Hubble constant based on a calibration of the Tip of the Red Giant Branch (TRGB) applied to Type Ia supernovae (SNeIa). We find a value of Ho = 69.8 +/- 0.8 (+/-1.1\% stat) +/- 1.7 (+/-2.4\% sys) km/sec/Mpc. The TRGB method is both precise and accurate, and is parallel to, but independent of the Cepheid distance scale. Our value sits midway in the range defined by the current Hubble tension. It agrees at the 1.2-sigma… 
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