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Velocity Dispersion in Small Systems of Galaxies

Published online by Cambridge University Press:  14 August 2015

I. D. Karachentsev
I. D. Karachentsev*
Affiliation:
Special Astrophysical Observatory Academy of Sciences, USSR

Extract

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During recent years the problem of the virial paradox has grown less acute for many galactic systems, especially for those having few members. As an example one can take the revision of virial mass-to-luminosity ratio, f = M/L, for de Vaucouleurs' groups performed by Materne and Tammann (1974). the reduction of the f-estimate is due to various reasons: an increase in accuracy in measuring radial velocities of galaxies, especially noticeable for 21-cm surveys of groups (Fisher and Tully 1975), regard for the sub-structure of systems of galaxies and improved exclusion of accidental members of groups (referred to here as “optical” members). Some very scattered systems proved to be low-contrast fluctuations of the expanding background, and not physical groups in their usual sense.

Type
I. Galaxies in Small Groups
Information
Symposium - International Astronomical Union , Volume 79: The Large Scale Structure of the Universe , 1978 , pp. 11 - 20
Copyright
Copyright © Reidel 1978 

References

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