Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Hernquist model revisited: completely analytical anisotropic
  dynamical models   Simple analytical models, such as the Hernquist model, are very useful tools
to investigate the dynamical structure of galaxies. Unfortunately, most of the
analytical distribution functions are either isotropic or of the
Osipkov-Merritt type, and hence basically one-dimensional. We present three
different families of anisotropic distribution functions that self-consistently
generate the Hernquist potential-density pair. These families have constant,
increasing and decreasing anisotropy profiles respectively, and can hence
represent a wide variety of orbital structures. For all of the models
presented, the distribution function and the velocity dispersions can be
written in terms of elementary functions. These models are ideal tools for a
wide range of applications, in particular to generate the initial conditions
for N-body or Monte Carlo simulations.

27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom