The redshift-distance relation. VIII - Magnitudes and redshifts of southern galaxies in groups: A further mapping of the local velocity field and an estimate of the deceleration parameter

1975 ◽  
Vol 202 ◽  
pp. 563 ◽  
Author(s):  
A. Sandage
Keyword(s):  
Velocity Field ◽  
Deceleration Parameter ◽  
Local Velocity ◽  
Distance Relation

scholarly journals The Hubble Constant and the Deceleration Parameter

1974 ◽  
Vol 63 ◽  
pp. 47-59
Author(s):  
G. A. Tammann
Keyword(s):  
Velocity Field ◽  
Deceleration Parameter ◽  
Preliminary Report ◽  
Hubble Constant ◽  
Intrinsic Properties ◽  
Local Anisotropy ◽  
A Chain ◽  
Distance Indicators ◽  
Luminosity Evolution ◽  
Parent Galaxy

A preliminary report is given of recent work with A. Sandage on the Hubble constant. Through a chain of distance indicators in Sc and Ir galaxies (cepheids, brightest stars, H iiregions, and luminosity classes) the distance scale is carried beyond any possible local anisotropy of the velocity field. Special care is taken to allow for the dependence of the intrinsic properties of the distance indicators on the size of the parent galaxy, and for the effect of the Malmquist correction. H0 is found to be 55 ± 7 km s-1 Mpc-1; within the errors no systematic changes with distance were found.A formal value of the deceleration constant q0 = 1 ± 1 was recently derived by Sandage (1972a) and Sandage and Hardy (1973). The most important correction to this value is probably the luminosity evolution of galaxies, which tends to push q0 below 0.5. The ensuing evidence for an open universe is also favored by independent arguments.

The Local Velocity Field

2008 ◽  
Author(s):  
Karen Masters ◽  
Robert Minchin ◽  
Emmanuel Momjian
Keyword(s):  
Velocity Field ◽  
Local Velocity

Experimental study of the velocity field in Rayleigh-Bénard convection

1978 ◽  
Vol 85 (4) ◽  
pp. 641-653 ◽  
Author(s):  
M. Dubois ◽  
P. Bergé
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Local Velocity ◽  
Velocity Measurements ◽  
Bénard Convection ◽  
Benard Convection ◽  
Theoretical Predictions ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard ◽  
Velocity Mode

Local velocity measurements performed in a convecting layer of fluid show that the velocity field can be described by a dominant fundamental velocity mode mixed with an increasing proportion of second and third harmonics as ε, the reduced distance to the convective thresholdRc, is increased from 0 to ∼ 10. The spatial and thermal dependences of the amplitudes of these different modes are reported and compared with theoretical predictions.

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