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Properties of AGN coronae in the NuSTAR era – II. Hybrid plasma

Fabian, A. C. and Lohfink, A. and Belmont, R. and Malzac, J. and Coppi, P. (2017) Properties of AGN coronae in the NuSTAR era – II. Hybrid plasma. Monthly Notices of the Royal Astronomical Society, 467 (3). pp. 2566-2570. ISSN 0035-8711.

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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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Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We thank the referee for helpful comments. ACF and AL acknowledge support from ERC Advanced Grant FEEDBACK 340442. R. Belmont and J. Malzac acknowledge financial support from the French National Research Agency (CHAOS project ANR-12-BS05-0009).
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ID Code:75585
Deposited By: Joy Painter
Deposited On:31 Mar 2017 18:11
Last Modified:13 Apr 2017 22:51

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