Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant

  title={Milky Way Cepheid Standards for Measuring Cosmic Distances and Application to Gaia DR2: Implications for the Hubble Constant},
  author={Adam G. Riess and Stefano Casertano and Wenlong Yuan and Lucas M. Macri and Beatrice Bucciarelli and Mario Gilberto Lattanzi and John W. MacKenty and J. Bradley Bowers and Weikang Zheng and Alexei V. Filippenko and Caroline D. Huang and Richard I. Anderson},
  journal={The Astrophysical Journal},
We present HST photometry of a selected sample of 50 long-period, low-extinction Milky Way Cepheids measured on the same WFC3 F555W, F814W, and F160W-band photometric system as extragalactic Cepheids in SN Ia hosts. These bright Cepheids were observed with the WFC3 spatial scanning mode in the optical and near-infrared to mitigate saturation and reduce pixel-to-pixel calibration errors to reach a mean photometric error of 5 millimags per observation. We use the new Gaia DR2 parallaxes and HST… Expand

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