By Topic

Mass determination in galaxies, groups of galaxies, and clusters of galaxies

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
M. J. Valtonen ; Dept. of Phys. Sci., Turku Univ., Finland ; G. G. Byrd

Computer simulations of interacting galaxies are used to determine the contribution of halos in disk galaxies. It appears that generally the halo is less massive than the disk. Redshift asymmetries are used to separate binary pairs from optical pairs in catalogs of galaxy pairs. It is found that true binary pairs give a rather low mass for the components. Redshift asymmetries also indicate that groups of galaxies are ill-suited for mass determination, either because they are in an unknown state of expansion or because they are not gravitationally bound at all. It is argued that so-called cluster missing mass cannot exist for dynamical reasons, and the high-velocity dispersion of member galaxies is more likely to indicate incomplete virialization than a high mass. The commonly quoted density parameter value Ω≅0.2 appears to be definitely too high, at least in scales less than 10 Mpc

Published in:

IEEE Transactions on Plasma Science  (Volume:18 ,  Issue: 1 )