Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coupled radio and X-ray emission and evidence for discrete ejecta in the
  jets of SS 433   We present five epochs of simultaneous radio (VLA) and X-ray (Chandra)
observations of SS 433, to study the relation between the radio and X-ray
emission in the arcsecond-scale jets of the source. We detected X-ray emission
from the extended jets in only one of the five epochs of observation,
indicating that the X-ray reheating mechanism is transient. The reheating does
not correlate with the total flux in the core or in the extended radio jets.
However, the radio emission in the X-ray reheating regions is enhanced when
X-ray emission is present. Deep images of the jets in linear polarization show
that outside of the core, the magnetic field in the jets is aligned parallel to
the local velocity vector, strengthening the case for the jets to be composed
of discrete bullets rather than being continuous flux tubes. We also observed
anomalous regions of polarized emission well away from the kinematic trace,
confirming the large-scale anisotropy of the magnetic field in the ambient
medium surrounding the jets.

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The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th