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OPTICAL IDENTIFICATION OF CEPHEIDS IN 19 HOST GALAXIES OF TYPE Ia SUPERNOVAE AND NGC 4258 WITH THE HUBBLE SPACE TELESCOPE
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Number of Authors: 13
2016 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 830, no 1, 10Article in journal (Refereed) Published
Abstract [en]

We present results of an optical search conducted as part of the SH0ES project (Supernovae and H-0 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 H-0 with a total uncertainty of 2.4%.

Place, publisher, year, edition, pages
2016. Vol. 830, no 1, 10
Keyword [en]
distance scale, galaxies: distances and redshifts, cosmology: observations, stars: variables: Cepheids
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-143870DOI: 10.3847/0004-637X/830/1/10ISI: 000400461800004OAI: oai:DiVA.org:su-143870DiVA: diva2:1105057
Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2017-06-02Bibliographically approved

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Goobar, ArielAmanullah, Rahman
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Citation style
  • apa
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