Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-13
Prog.Theor.Phys.Suppl.162:62-69,2006
Astronomy and Astrophysics
Astrophysics
8 pages, 5 figures, Proceedings of CN-Kyoto International Workshop on Complexity and Nonextensivity; added a reference for sec
Scientific paper
10.1143/PTPS.162.62
The collisionless quasi-equilibrium state realized after the cold collapse of self-gravitating systems has two remarkable characters. One of them is the linear temperature-mass (TM) relation, which yields a characteristic non-Gaussian velocity distribution. Another is the local virial (LV) relation, the virial relation which holds even locally in collisionless systems through phase mixing such as cold-collapse. A family of polytropes are examined from a view point of these two characters. The LV relation imposes a strong constraint on these models: only polytropes with index $n \sim 5$ with a flat boundary condition at the center are compatible with the numerical results, except for the outer region. Using the analytic solutions based on the static and spherical Jeans equation, we show that this incompatibility in the outer region implies the important effect of anisotropy of velocity dispersion. Furthermore, the velocity anisotropy is essential in explaining various numerical results under the condition of the local virial relation.
Iguchi Osamu
Morikawa Masahiro
Nakamichi Akika
Sota Yasuhide
No associations
LandOfFree
Local virial relation and velocity anisotropy for collisionless self-gravitating 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 Local virial relation and velocity anisotropy for collisionless self-gravitating systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Local virial relation and velocity anisotropy for collisionless self-gravitating systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-495312