Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density waves in the central regions of galaxies   Density waves in the central kpc of galaxies, taking the form of spirals,
bars and/or lopsided density distributions are potential actors of the
redistribution of angular momentum. They thus play an important role in the
overall evolution of the central structures, not mentioning the possible link
with the active/non-active nucleus. I present here kinematical evidences for
the presence of such structures using new sets of observations: two-dimensional
(OASIS/CFHT) and long-slit (ISAAC/VLT) spectrography of nuclear bars and
spirals. I also discuss the importance of $m=1$ modes in the nuclear regions of
galaxies, illustrating this with newly revealed cases and original N body
simulations.

12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs