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Resolving the Soft X-Ray Ultrafast Outflow in PDS 456
The Astrophysical Journal ( IF 5.745 ) Pub Date : 2020-05-21 , DOI: 10.3847/1538-4357/ab8cc4
J. N. Reeves, V. Braito, G. Chartas, F. Hamann, S. Laha, and E. Nardini

Past X-ray observations of the nearby luminous quasar PDS 456 (at z = 0.184) have revealed a wide-angle accretion disk wind with an outflow velocity of ∼−0.25 c , as observed through observations of its blueshifted iron K-shell absorption line profile. Here we present three new XMM-Newton observations of PDS 456: one in 2018 September where the quasar was bright and featureless and two in 2019 September, 22 days apart, occurring when the quasar was five times fainter and where strong blueshifted lines from the wind were present. During the second 2019 September observation, three broad ( σ = 3000 km s −1 ) absorption lines were resolved in the high-resolution Reflection Grating Spectrometer spectrum that are identified with blueshifted O viii Ly α , Ne ix He α , and Ne x Ly α . The outflow velocity of this soft X-ray absorber was found to be v / c = −0...
更新日期:2020-05-21

 

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