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Hot Coronae in Local AGN: Present Status and Future Perspectives

Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Rome, Italy
Astronomical Institute of the Czech Academy of Sciences, CZ-14100 Prague, Czech Republic
INAF/Istituto di Astrofisica e Planetologie Spaziali, Via Fosso del Cavaliere, I-00133 Roma, Italy
Author to whom correspondence should be addressed.
Galaxies 2018, 6(2), 44;
Received: 2 February 2018 / Revised: 19 March 2018 / Accepted: 19 March 2018 / Published: 4 April 2018
(This article belongs to the Special Issue The Bright Future of Astronomical X-ray Polarimetry)
PDF [362 KB, uploaded 3 May 2018]


The nuclear X-ray emission in radio-quiet Active Galactic Nuclei (AGN) is commonly believed to be due to inverse Compton scattering of soft UV photons in a hot corona. The radiation is expected to be polarized, the polarization degree depending mainly on the geometry and optical depth of the corona. Nuclear Spectroscopic Telescope Array (NuSTAR) observations are providing for the first time high quality measurements of the coronal physical parameters—temperature and optical depth. We hereby review the NuSTAR results on the coronal physical parameters (temperature and optical depth) and discuss their implications for future X-ray polarimetric studies. View Full-Text
Keywords: AGN; X-ray polarimetry; accretion AGN; X-ray polarimetry; accretion

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Marinucci, A.; Tamborra, F.; Bianchi, S.; Dovčiak, M.; Matt, G.; Middei, R.; Tortosa, A. Hot Coronae in Local AGN: Present Status and Future Perspectives. Galaxies 2018, 6, 44.

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