NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T16:59:51 PDT
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For refcode 2017MNRAS.467.2566F:
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Copyright by Royal Astronomical Society. 2017MNRAS.467.2566F Properties of AGN coronae in the NuSTAR era - II. Hybrid plasma Fabian, A. C.; Lohfink, A.; Belmont, R.; Malzac, J.; Coppi, P. Abstract. 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. 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 non-thermal particles is present. Pair production from the non-thermal component reduces the temperature leading to a wider temperature range more consistent with observations. Key words: black hole physics, X-rays: binaries
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