OPTICAL IDENTIFICATION OF CEPHEIDS IN 19 HOST GALAXIES OF TYPE Ia SUPERNOVAE AND NGC 4258 WITH THEHUBBLE SPACE TELESCOPE Academic Article uri icon

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abstract

  • We present results of an optical search for Cepheid variable stars using the Hubble Space Telescope (HST) in 19 hosts of Type Ia supernovae (SNe Ia) and the maser-host galaxy NGC 4258, conducted as part of the SH0ES project (Supernovae and H0 for the Equation of State of dark energy). The targets include 9 newly imaged SN Ia hosts using a novel strategy based on a long-pass filter that minimizes the number of HST orbits required to detect and accurately determine Cepheid properties. We carried out a homogeneous reduction and analysis of all observations, including new universal variability searches in all SN Ia hosts, that yielded a total of 2200 variables with well-defined selection criteria -- the largest such sample identified outside the Local Group. These objects are used in a companion paper to determine the local value of H0 with a total uncertainty of 2.4%.

authors

  • Hoffmann, Samantha L
  • Macri, Lucas M
  • Riess, Adam G
  • Yuan, Wenlong
  • Casertano, Stefano
  • Foley, Ryan J
  • Filippenko, Alexei V
  • Tucker, Brad E
  • Chornock, Ryan
  • Silverman, Jeffrey M
  • Welch, Douglas L
  • Goobar, Ariel
  • Amanullah, Rahman

publication date

  • October 10, 2016