Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic Disc lines   Broad emission lines, particularly broad iron-K lines, are now commonly seen
in the X-ray spectra of luminous AGN and Galactic black hole binaries.
Sensitive NuSTAR spectra over the energy range of 3-78 keV and high frequency
reverberation spectra now confirm that these are relativistic disc lines
produced by coronal irradiation of the innermost accretion flow around rapidly
spinning black holes. General relativistic effects are essential in explaining
the observations. Recent results are briefly reviewed here.

16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
0
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: adap-org
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex