Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of AGN coronae in the NuSTAR era II: hybrid plasma   The corona, a hot cloud of electrons close to the centre of the accretion
disc, produces the hard X-ray power-law continuum commonly seen in luminous
Active Galactic Nuclei (AGN). The continuum has a high-energy turnover,
typically in the range of one to several 100 keV and is suggestive of
Comptonization by thermal electrons. We are studying hard X-ray spectra of AGN
obtained with NuSTAR after correction for X-ray reflection and under the
assumption that coronae are compact, being only a few gravitational radii in
size as indicated by reflection and reverberation modelling. Compact coronae
raise the possibility that the temperature is limited and indeed controlled by
electron-positron pair production, as explored earlier (Paper I). Here we
examine hybrid plasmas in which a mixture of thermal and nonthermal particles
is present. Pair production from the nonthermal component reduces the
temperature leading to a wider temperature range more consistent with
observations.

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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: math
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The categories of this paper are: q-fin