Evidence for massive ionised outflows in (super-Eddington?) AGN

Details Evidence for massive ionised outflows in (super-Eddington?) AGN Evidence for massive ionised outflows in (super-Eddington?) AGN

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nuphs.132..107p&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 132, p. 107-115.

Physics

Nuclear Physics

1

Scientific paper

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 XNN-Newton archival data of a second (high accretion rate) quasar PG0844+349. Evidence is found for several faint absorption lines in both the EPIC and RGS spectra, whose most likely 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 NH~4×1023 cm-2, at an ionisation parameter of logξ~3.7. Assuming a radial outflow being driven by radiation pressure from the inner accretion disc, as suggested previously for PG1211+143, the flow in PG0844+349 is also likely to be optically thick, in this case within ~25 Schwarzschild radii. We suggest that a high velocity, highly ionised outflow may be a significant component in the mass and energy budgets of AGN accreting at or above the Eddington rate.

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