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Is the X-ray spectrum of the narrow emission line QSO PG1211+143 defined by its energetic outflow?

By Kenneth A. Pounds and J.N. Reeves

Abstract

An XMM–Newton observation of the bright QSO PG1211+143 in 2001 revealed a blueshifted\ud absorption line spectrum indicative of a high-velocity radial outflow of highly ionized gas.\ud Unless highly collimated, the outflow mass rate was shown to be comparable to the accretion\ud rate, with mechanical energy a significant fraction of the bolometric luminosity. Analysis of\ud the full XMM–Newton data set now allows the wider effects of that energetic outflow to be\ud explored.We find that absorption and re-emission of the primary continuum flux in the ionized\ud outflow, together with a second, less strongly absorbed, continuum component can explain the\ud strong ‘soft excess’ in PG1211+143 without the extreme velocity ‘smearing’ in conflict with\ud observed absorption line widths. Previously unpublished data from a second XMM–Newton\ud observation of PG1211+143 is shown to be consistent with the new spectral model, finding\ud that the additional continuum component dominates the spectral variability.We speculate that\ud this variable continuum component is powered by the high-velocity outflow.Peer-reviewedPublisher versio

Topics: galaxies: active, galaxies: individual: PG1211+143, quasars: general, galaxies: Seyfert, X-rays: galaxies
Publisher: Blackwell
Year: 2007
DOI identifier: 10.1111/j.1365-2966.2006.11170.x
OAI identifier: oai:lra.le.ac.uk:2381/794
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  1. (2006). ApJ, 323, 343 This paper has been typeset from a TEX/LATEX file prepared by the author.
  2. (2006). The Authors. Journal compilation C© doi

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