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Walton, D. J.; Middleton, M. J.; Pinto, C.; Fabian, A. C.; Bachetti, M.; Barret, D.; Brightman, M.; Fuerst, F.; Harrison, F. A.; Miller, J. M.; Stern, D.
Astrophysical journal. Letters, 08/2016, Letnik: 826, Številka: 2Journal Article
ABSTRACT We present the detection of an absorption feature at E = 8.77 − 0.06 + 0.05 keV in the combined X-ray spectrum of the ultraluminous X-ray source NGC 1313 X-1 observed with XMM-Newton and NuSTAR, significant at the 3 level. If associated with blueshifted ionized iron, the implied outflow velocity is ∼0.2c for Fe xxvi, or ∼0.25c for Fe xxv. These velocities are similar to the ultrafast outflow seen in absorption recently discovered in this source at lower energies by XMM-Newton, and we therefore conclude that this is an iron component to the same outflow. Photoionization modeling marginally prefers the Fe xxv solution, but in either case the outflow properties appear to be extreme, potentially supporting a super-Eddington hypothesis for NGC 1313 X-1.
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