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The Carnegie Hubble Program: From parallaxes to the Tully–Fisher relation

Published online by Cambridge University Press:  26 February 2013

V. Scowcroft
Affiliation:
Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA email: vs@obs.carnegiescience.edu
W. L. Freedman
Affiliation:
Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA email: vs@obs.carnegiescience.edu
B. F. Madore
Affiliation:
Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA email: vs@obs.carnegiescience.edu
A. Monson
Affiliation:
Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA email: vs@obs.carnegiescience.edu
S. E. Persson
Affiliation:
Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA email: vs@obs.carnegiescience.edu
M. Seibert
Affiliation:
Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA email: vs@obs.carnegiescience.edu
C. Burns
Affiliation:
Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA email: vs@obs.carnegiescience.edu
J. R. Rigby
Affiliation:
Observational Cosmology Lab, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
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Abstract

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The Carnegie Hubble Program (CHP) is a Warm Spitzer program with the aim of reducing the uncertainty in the Hubble constant to below 3%. The program is calibrated using Galactic Cepheids with precise parallax distances from the Hubble Space Telescope (HST), combined with a large sample of Cepheids in the Large Magellanic Cloud. We extend the Cepheid distance scale to the Local Group and beyond, into the regime probed by the Tully–Fisher relation. The entire program—from Galactic Cepheids to the most distant galaxies—uses the Spitzer/IRAC instrument. Completing the entire program with a single instrument on a single telescope virtually eliminates instrumental effects, whilst moving to the mid-infrared drastically reduces the reddening and metallicity effects that trouble the optical Cepheid distance scale. Our first measurement of the Hubble constant, using only two CHP galaxies tied into the HST Key Project results has produced a measurement of H0 = 74.3 ± 2.1 (systematic) km s−1 Mpc−1, which corresponds to a systematic uncertainty of 2.8%.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013

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