NTRS - NASA Technical Reports Server

Back to Results
H0, q0 and the local velocity fieldAn attempt is made to find a systematic deviation from linearity for distances that are under the control of the Virgo cluster, and to determine the value of the mean random motion about the systematic flow, in order to improve the measurement of the Hubble and the deceleration constants. The velocity-distance relation for large and intermediate distances is studied, and type I supernovae are calibrated relatively as distance indicators and absolutely to obtain a new value for the Hubble constant. Methods of determining the deceleration constant are assessed, including determination from direct measurement, mean luminosity density, virgocentric motion, and the time scale test. The very local velocity field is investigated, and a solution is preferred with a random peculiar radial velocity of very nearby field galaxies of 90-100 km/s, and a Virgocentric motion of the local group of 220 km/s, leading to an underlying expansion rate of 55, in satisfactory agreement with the global value.
Document ID
Document Type
Conference Proceedings
Sandage, A. (Mount Wilson and Las Campanas Observatories Pasadena, CA, United States)
Tammann, G. A. (Basel, Universitaet Basel, Switzerland; European Southern Observatory, Garching, Germany)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Subject Category
Meeting Information
Astrophysical cosmology(Vatican City State)
Funding Number(s)
Distribution Limits