The ‘harder when brighter’ X-ray behaviour of the low-luminosity active galactic nucleus NGC 7213

Author: Emmanoulopoulos D.   Papadakis I. E.   McHardy I. M.   Arévalo P.   Calvelo D. E.   Uttley P.  

Publisher: Oxford University Press

ISSN: 0035-8711

Source: Monthly Notices of the Royal Astronomical Society, Vol.424, Iss.2, 2012-08, pp. : 1327-1334

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