TY - JOUR
T1 - OPTICAL IDENTIFICATION of CEPHEIDS in 19 HOST GALAXIES of TYPE Ia SUPERNOVAE and NGC 4258 with the HUBBLE SPACE TELESCOPE
AU - Hoffmann, Samantha L.
AU - Macri, Lucas M.
AU - Riess, Adam G.
AU - Yuan, Wenlong
AU - Casertano, Stefano
AU - Foley, Ryan J.
AU - Filippenko, Alexei V.
AU - Tucker, Brad E.
AU - Chornock, Ryan
AU - Silverman, Jeffrey M.
AU - Welch, Douglas L.
AU - Goobar, Ariel
AU - Amanullah, Rahman
N1 - Funding Information:
This project was funded by STScI through HST grants associated with the following programs: GO-12880, GO-13646, and GO-13647. S.L.H., L.M.M., and W.Y. acknowledge financial support by the Mitchell Institute for Fundamental Physics & Astronomy at Texas A&M University. R.J.F. gratefully acknowledges support from NASA grant 14-WPS14-0048, NSF grant AST-1518052, and the Alfred P. Sloan Foundation. A.V.F. has received generous financial assistance from the Christopher R. Redlich Fund, the TABASGO Foundation, Gary & Cynthia Bengier, and NSF grant AST-1211916.
Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.
PY - 2016/10/10
Y1 - 2016/10/10
N2 - 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%.
AB - 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%.
KW - cosmology: observations
KW - distance scale
KW - galaxies: distances and redshifts
KW - stars: variables: Cepheids
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U2 - 10.3847/0004-637X/830/1/10
DO - 10.3847/0004-637X/830/1/10
M3 - Article
AN - SCOPUS:84991110340
SN - 0004-637X
VL - 830
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 10
ER -