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The relation of local measures of Hubble's constant to its global valueThe distributions of fractional deviations of local values form global H0 that observers with perfect distance data would find if they surveyed specified volumes of the universe are examined here using new very large scale calculations of cold dark matter (CDM) and primordial isocurvature baryonic (PIB) scenarios for the origin of structure. It is found that the expected deviations due to large-scale motions are larger than quoted observational errors unless very large volumes are surveyed. Even perfect sampling and distances of all galaxies within a sphere extending out to the distances of the Virgo and Coma clusters would leave 45 percent and 3 percent rms uncertainties, respectively, in the global value of H0 in the CDM model. It is shown that the local versus global error in an H0 determination can be roughly estimated by the angular variance seen over the sky in the expansion rate, and that a very rough correction from the local to the global H0 value can be derived.
Document ID
19920053180
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Turner, Edwin L.
(NASA Headquarters Washington, DC United States)
Cen, Renyue
(NASA Headquarters Washington, DC United States)
Ostriker, Jeremiah P.
(Princeton University Observatory, NJ, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1992
Publication Information
Publication: Astronomical Journal
Volume: 103
Issue: 5 Ma
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
92A35804
Funding Number(s)
CONTRACT_GRANT: NAGW-2448
Distribution Limits
Public
Copyright
Other

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