Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-wavelength behaviour of IIIZw2   IIIZw2 was observed with XMM-Newton in July 2000. Its X-ray spectrum can be
described by a powerlaw of photon index Gamma = 1.7 with a Gaussian line at 6.7
keV. There is no significant evidence of intrinsic absorption within the source
or of a soft X-ray excess.
  Multi-wavelength light curves over a period of 25 years show related
variations from the radio to the X-rays. We interpret the radio to optical
emission as synchrotron radiation, self-absorbed in the radio/millimeter
region, and the X-rays as mainly due to Compton up-scattering of low-energy
photons by the population of high-energy electrons that give rise to the
synchrotron radiation.

2
The categories of this paper are: math
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
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
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga