Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of Non Thermal X-Rays from the Northwest Shell of the New SNR
  RX J1713.7-3946: The Second SN1006 ?   We report ASCA results of a featureless X-ray spectrum from RX J1713.7-3946,
a new shell-like SNR discovered with the ROSAT all sky survey. The northwest
part of RX J1713.7-3946 was in the field of the ASCA Galactic Plane Survey
Project and was found to exhibit a shell-like structure. The spectrum, however
shows neither line emission nor any signature of a thermal origin. Instead, a
power-law model with a photon index of 2.4-2.5 gives reasonable fit to the
spectrum, suggesting a non-thermal origin. Together with the similarity to
SN1006, we propose that RX J1713.7-3946 is the second example, after SN1006, of
a synchrotron X-ray radiation from a shell of SNRs. Since the synchrotron
X-rays suggest existence of extremely high energy charged particles in the SNR
shell, our discovery should have strong impact on the origin of the cosmic
X-rays.

37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio