Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-29
Mon.Not.Roy.Astron.Soc. 346 (2003) 1025
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2003.07164.x
Following the discovery of X-ray absorption in a high velocity outflow from the bright quasar PG1211+143 we have searched for similar features in XMM archival data of a second (high accretion rate) quasar PG0844+349. Evidence is found for absorption lines in both the EPIC and RGS spectra, whose identification with resonance transitions in H-like Fe, S, and Ne implies an origin in highly ionised matter with an outflow velocity of order ~0.2c. The line equivalent widths require a line-of-sight column density of N_H ~ 4 x 10^23 cm^-2, at an ionisation parameter of log(xi) ~ 3.7. Assuming a radial outflow being driven by radiation pressure from the inner accretion disc, as suggested previously for PG1211+143, the flow is again likely to be optically thick, in this case within ~ 25 Schwarzschild radii. We suggest that a high velocity, highly ionised outflow is likely to be a significant component in the mass and energy budgets of many AGN accreting at or above the Eddington rate.
King Andrew R.
O'Brien Thomas P.
Page Kim L.
Pounds Kenneth A.
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