Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on the discovery of absorption features in 1E 1207.4-5209   In a paper by Sanwal et al. (2002), it is supposed to be very difficult to
interpret the absorption features in term of cyclotron lines. However, we would
like to address here that the possibility of the absorption being cyclotron
resonance can not be ruled out.We propose that the isolate neutron star, 1E
1207.4-5209 in the center of supernova remnant PKS 1209-51/52, has a debris
disk and is in a propeller phase, with an accretion rate 6x10^{-11}
M_solar/year.

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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an