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Title:
The Hubble flow from brightest cluster galaxies
Authors:
Lauer, Tod R.; Postman, Marc
Affiliation:
AA(Kitt Peak National Observatory, Tucson, AZ), AB(Space Telescope Science Inst., Baltimore, MD)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 400, no. 2, p. L47-L50. (ApJL Homepage)
Publication Date:
12/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmology, Galactic Clusters, Hubble Diagram, Universe, Astronomical Photometry, Hubble Constant, Local Group (Astronomy), Luminosity, Sky Surveys (Astronomy)
DOI:
10.1086/186646
Bibliographic Code:
1992ApJ...400L..47L

Abstract

Initial results are presented from a reinvestigation of the Brightest Cluster Galaxy (BGC) distance scale, which includes richer sampling and complete all-sky observations of Abell clusters within 15,000 km/s. Virgo BCG, NGC 4472, is used to calibrate the BCG Hubble diagram directly, independent of the Virgocentric infall pattern. For the observed distance to NGC 4472 of 14.4 Mpc, H0 = 77 +/- 8 km/s Mpc. Alternatively, if NGC 4472 is at the Sandage and Tammann (1990) 21.9 Mpc distance to Virgo, then H0 = 51 +/- 5. The BCG Hubble constant on either the short or long system is consistent with Hubble constants measured on the same system within the local supercluster. Plausible high values of H0 observed within the local supercluster therefore cannot be explained as biased measures of the true H0 due to velocity anomalies induced by large-scale structure.

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