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|Title:||Evidence of a high-velocity ionized outflow in a second narrow-line quasar PG 0844+349|
|Authors:||Pounds, Kenneth A.|
King, Andrew R.
Page, Kim L.
O'Brien, Paul T.
|Citation:||Monthly Notices of the Royal Astronomical Society, 2003, 346, pp.1025-1030.|
|Abstract:||Following the discovery of X-ray absorption in a high-velocity outflow from the bright quasar PG 1211 + 143 we have searched for similar features in XMM–Newton archival data of a second (high accretion rate) quasar PG 0844+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 ionized matter with an outflow velocity of order ~0.2c. The line equivalent widths require a line-of-sight column density of NH ~4 × 10²³ cm², at an ionization parameter of log ξ ~3.7. Assuming a radial outflow being driven by radiation pressure from the inner accretion disc, as suggested previously for PG 1211 + 143, the flow in PG 0844+349 is also likely to be optically thick, in this case within ~25 Schwarzschild radii. Our analysis suggests that a high-velocity, highly ionized outflow is likely to be a significant component in the mass and energy budgets of active galactic nuclei accreting at or above the Eddington rate.|
|Rights:||© 2003 Royal Astronomical Society (RAS). Deposited with reference to the publisher's archiving policy available on the journal's website.|
|Description:||The definitive version is available at www.blackwell-synergy.com|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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