Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-04
Mon.Not.Roy.Astron.Soc.374:823-831,2007
Astronomy and Astrophysics
Astrophysics
10 pages, 13 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.11170.x
An XMM-Newton observation of the bright QSO PG1211+143 in 2001 revealed a blue-shifted absorption line spectrum indicative of a high velocity radial outflow of highly ionised gas. Unless highly collimated, the outflow mass rate was shown to be comparable to the accretion rate, with mechanical energy a significant fraction of the bolometric luminosity. Analysis of the full XMM-Newton data set now allows the wider effects of that energetic outflow to be explored. We find that absorption and re-emission of the primary continuum flux in the ionised outflow, together with a second, less strongly absorbed, continuum component can explain the strong `soft excess' in PG1211+143 without the extreme velocity `smearing' in conflict with observed absorption line widths. Previously unpublished data from a second XMM-Newton observation of PG1211+143 is shown to be consistent with the new spectral model, finding that the additional continuum component dominates the spectral variability. We speculate that this variable continuum component is powered by the high velocity outflow.
Pounds Kenneth A.
Reeves James N.
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