New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant

@article{Riess2018NewPO,
  title={New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant},
  author={A. Riess and S. Casertano and W. Yuan and L. Macri and J. Anderson and J. Mackenty and J. Bowers and K. Clubb and A. Filippenko and D. Jones and B. Tucker},
  journal={The Astrophysical Journal},
  year={2018},
  volume={855},
  pages={136}
}
  • A. Riess, S. Casertano, +8 authors B. Tucker
  • Published 2018
  • Physics
  • The Astrophysical Journal
  • We present new parallax measurements of 7 long-period (> 10 days) Milky Way Cepheids (SS CMa, XY Car, VY Car, VX Per, WZ Sgr, X Pup and S Vul) using astrometry from spatial scanning of WFC3 on HST. Observations were obtained at 6 month intervals over 4 years. The distances are 1.7--3.6 kpc with a mean precision of 45 microarcseconds and a best of 29 microarcseconds (SNR = 14). The accuracy of the parallaxes is demonstrated through independent analyses of >100 reference stars. This raises to 10… CONTINUE READING
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