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An extensive multi-satellite campaign on NGC 5548 has revealed thisarchetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavyabsorption. Our observations taken in 2013-2014 with XMM-Newton, Swift, NuSTAR,INTEGRAL, Chandra, HST and two ground-based observatories have together enabledus to establish that this unexpected phenomenon is caused by an outflowingstream of weakly ionised gas (called the obscurer), extending from the vicinityof the accretion disk to the broad-line region. In this work we present thedetails of our campaign and the data obtained by all the observatories. Wedetermine the spectral energy distribution of NGC 5548 from near-infrared tohard X-rays by establishing the contribution of various emission and absorptionprocesses taking place along our line of sight towards the central engine. Wethus uncover the intrinsic emission and produce a broadband continuum model forboth obscured (average summer 2013 data) and unobscured ($<$ 2011) epochs ofNGC 5548. Our results suggest that the intrinsic NIR/optical/UV continuum is asingle Comptonised component with its higher energy tail creating the 'softX-ray excess'. This component is compatible with emission from a warm,optically-thick corona as part of the inner accretion disk. We then investigatethe effects of the continuum on the ionisation balance and thermal stability ofphotoionised gas for unobscured and obscured epochs.

Anatomy of the AGN in NGC 5548: I. A global model for the broadband spectral energy distribution