Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Axisymmetric mass models of S0 and spiral galaxies with boxy bulges:
  mass-to-light ratios, dark matter and bars   We examine a sample of 30 edge-on spiral and S0 galaxies that have boxy and
peanut-shaped bulges. We compute model stellar kinematics by solving the Jeans
equations for axisymmetric mass distributions derived from K-band images. These
simple models have only one free parameter: the dynamical mass-to-light ratio,
which we assume is independent of radius. Given the simplicity of the modelling
procedure, the model second velocity moments are strikingly good fits to the
observed stellar kinematics within the extent of our kinematic data, which
typically reach ~ 0.5-1 R25 (where R25 is the optical radius), or equivalently
2-3 Re (where Re is the effective or half-light radius). We therefore find no
evidence for a dominant dark matter component within the optical disk of spiral
galaxies. This is equally true of the S0s in our sample, which significantly
extends previous observational constraints on dark matter in these galaxies.
The predicted kinematics do deviate slightly but systematically from the
observations in the bulge region of most galaxies, but we argue that this is
consistent with the claim that boxy and peanut-shaped bulges are bars viewed
edge-on.

31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs