Broad absorption features in wind-dominated ultraluminous X-ray sources?
Middleton, M.J.; Walton, D.J.; Roberts, T.P.; Heil, L.
Professor Tim Roberts email@example.com
The luminosities of ultraluminous X-ray sources (ULXs) require an exotic solution with either supercritical accretion modes on to stellar-mass black holes or subcritical accretion on to intermediate-mass black holes (IMBHs) being invoked. Discriminating between the two is non-trivial due to the present lack of a direct mass measurement. A key expectation of the supercritical mode of accretion is the presence of powerful radiatively driven winds. Here we analyse XMM–Newton data from NGC 5408 X-1 and NGC 6946 X-1 and find that strong soft residuals present in the X-ray spectra can be reconciled with broadened, blueshifted absorption by a partially ionized, optically thin phase of this wind. We derive initial values for the physical parameters of the wind; we also discuss other possible origins for the observed features.
Middleton, M., Walton, D., Roberts, T., & Heil, L. (2014). Broad absorption features in wind-dominated ultraluminous X-ray sources?. Monthly Notices of the Royal Astronomical Society, 438(1), L51-L55. https://doi.org/10.1093/mnrasl/slt157
|Journal Article Type||Article|
|Acceptance Date||Oct 30, 2013|
|Online Publication Date||Dec 12, 2013|
|Publication Date||Feb 11, 2014|
|Deposit Date||Jan 24, 2014|
|Publicly Available Date||Jan 29, 2014|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
|Keywords||Accretion discs, Black hole physics, X-rays, Binaries.|
Published Journal Article
This article has been published in the Monthly Notices of the Royal Astronomical Society. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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