Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Importance of Shocks in the Ionization of the Narrow Line Region of
  Seyferts   We discuss the viability of shocks as the principal source of ionization for
the Narrow Line Region of Seyfert galaxies. We present the preliminary results
of [OIII]5007A and radio 3.6 cm imaging surveys of Seyferts, discuss the
effects of shocks in the ionization of two galaxies, and also calculate an
upper limit to the Hbeta luminosity that can be due to shocks in 36 galaxies
with unresolved radio emission. We show that, for favored values of the shock
parameters, that shocks cannot contribute more than ~15% of the ionizing
photons in most galaxies.

9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs