Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for Nonlinear Diffusive Shock Acceleration of Cosmic Rays in
  the 2006 Outburst of RS Ophiuchi   Spectroscopic observations of the 2006 outburst of RS Oph at both infrared
(IR) and X-ray wavelengths have shown that the blast wave has decelerated at a
higher rate than predicted by the standard test-particle adiabatic shock-wave
model. The observed blast-wave evolution can be explained, however, by the
diffusive shock acceleration of particles at the forward shock and the
subsequent escape of the highest energy ions from the acceleration region.
Nonlinear particle acceleration can also account for the difference of shock
velocities deduced from the IR and X-ray data. We discuss the evolution of the
nova remnant in the light of efficient particle acceleration at the blast wave.

30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph