Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353...59m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 59-65. Research supported by the University of the
Astronomy and Astrophysics
Astrophysics
5
Density Distribution, Galactic Clusters, Spatial Distribution, Velocity Distribution, Entropy, Galactic Mass, Hydrodynamic Equations
Scientific paper
If the galaxy velocity dispersion in a cluster of galaxies is constant, the cluster is in hydrostatic equilibrium, and it has a dark-matter component, then virial considerations reveal the average logarithmic slope of the galaxy distribution profile to be -3. This applies both to isotropic and (constant) anisotropic galaxy velocity distributions. Maximum-entropy considerations indicate that hydrostatic equilibrium is most likely to be manifested in connection with a flat dispersion curve. Combined with logarithmic potential, whose preferred status has theoretical and observational support, an r exp (-2.9 + or - 0.1) profile is enforced for the galaxy spatial distribution. Since constant velocity dispersion and the logarithmic potential are a likely combination in stationary systems, approximately r exp -3 galaxy density profiles should be prevalent in clusters, as is indeed observed.
Bekenstein Jacob D.
Maoz Eyal
No associations
LandOfFree
On the prevalence of R exp -3 density profiles in extragalactic systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the prevalence of R exp -3 density profiles in extragalactic systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the prevalence of R exp -3 density profiles in extragalactic systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1380006