Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SDSS J090152.05+624342.6: A New "Overlapping-Trough" FeLoBAL Quasar At
  Z$\sim2$   We here report an identification of SDSS J090152.04+624342.6 as a new
"overlapping-trough" iron low-ionization broad absorption line quasar at
redshift of $z\sim2.1$. No strong variation of the broad absorption lines can
be revealed through the two spectra taken by the Sloan Digital Sky Survey with
a time interval of $\sim6$yr. Further optical and infrared spectroscopic study
on this object is suggested.

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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom