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25 April 2024

» arxiv » 1411.2157

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Anatomy of the AGN in NGC 5548: II. The Spatial, Temporal and Physical Nature of the Outflow from HST/COS Observations
N. Arav ; C. Chamberlain ; G.A. Kriss ; J.S. Kaastra ; M. Cappi ; M. Mehdipour ; P.-O. Petrucci ; K.C. Steenbrugge ; E. Behar ; S. Bianchi ; R. Boissay ; G. Branduardi-Raymont ; E. Costantini ; J.C. Ely ; J. Ebrero ; L. di Gesu ; F.A. Harrison ; S.Kaspi ; J. Malzac ; B. De Marco ; G. Matt ; K.P. Nandra ; S. Paltani ; B.M. Peterson ; C. Pinto ; G. Ponti ; F. Pozo Nuñez ; A. De Rosa ; H. Seta ; F. Ursini ; C.P.de Vries ; D.J.Walton ; M. Whewel ;
Date:	8 Nov 2014
Abstract:	(Abridged) Our deep multiwavelength campaign on NGC 5548 revealed an unusually strong X-ray obscuration. The resulting dramatic decrease in incident ionizing flux allowed us to construct a comprehensive physical, spatial and temporal picture for the long-studied AGN wind in this object. Here we analyze the UV spectra of the outflow acquired during the campaign as well as from four previous epochs. We find that a simple model based on a fixed total column-density absorber, reacting to changes in ionizing illumination, matches the very different ionization states seen in five spectroscopic epochs spanning 16 years. Absorption troughs from C III* appeared for the first time during our campaign. From these troughs, we infer that the main outflow component is situated at 3.5+-1 pc from the central source. Three other components are situated between 5-70 pc and two are further than 100 pc. The wealth of observational constraints and the disparate relationship of the observed X-ray and UV flux between different epochs make our physical model a leading contender for interpreting trough variability data of quasar outflows.
Source:	arXiv, 1411.2157
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