OPTICAL IDENTIFICATION of CEPHEIDS in 19 HOST GALAXIES of TYPE Ia SUPERNOVAE and NGC 4258 with the HUBBLE SPACE TELESCOPE

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

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We present results of an optical search conducted as part of the SH0ES project (Supernovae and H0 for the Equation of State of dark energy) 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. The targets include nine 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, which 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%.

Original languageEnglish (US)
Article number10
JournalAstrophysical Journal
Volume830
Issue number1
DOIs
StatePublished - Oct 10 2016
Externally publishedYes

Keywords

  • cosmology: observations
  • distance scale
  • galaxies: distances and redshifts
  • stars: variables: Cepheids

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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