Journal
ASTRONOMICAL JOURNAL
Volume 149, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/149/6/183
Keywords
distance scale; galaxies: individual (NGC 4258); stars: variables: Cepheids
Categories
Funding
- NASA [HST-GO-09810, HST-GO-10399, HST-GO-10802, HST-GO-12880]
- Texas AM University
- Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University
- NASA through Hubble Fellowship grant from the Space Telescope Science Institute [HST-HF-01153]
- National Science Foundation through a Goldberg Fellowship from the National Optical Astronomy Observatory
- Alfred P. Sloan Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- National Aeronautics and Space Administration's Earth Science Technology Office, Computational Technologies Project [NCC5-626]
- National Science Foundation [AST09-08846]
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- New Mexico State University
- National Science Foundation
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We present results of a ground-based survey for Cepheid variables in NGC 4258. This galaxy plays a key role in the Extragalactic Distance Scale due to its very precise and accurate distance determination via very long baseline interferometry observations of water masers. We imaged two fields within this galaxy using the Gemini North telescope and the Gemini Multi-Object Spectrograph, obtaining 16 epochs of data in the Sloan Digital Sky Survey gri bands over 4 yr. We carried out point-spread function photometry and detected 94 Cepheids with periods between 7 and 127 days, as well as an additional 215 variables which may be Cepheids or Population II pulsators. We used the Cepheid sample to test the absolute calibration of theoretical gri Period-Luminosity relations and found good agreement with the maser distance to this galaxy. The expected data products from the Large Synoptic Survey Telescope should enable Cepheid searches out to at least 10 Mpc.
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