Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 438, Issue 1, Pages L51-L55Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slt157
Keywords
accretion, accretion discs; black hole physics; X-rays: binaries
Categories
Funding
- Marie Curie FP7 Postdoctoral scholarship
- STFC [ST/K000861/1]
- ESA Member States
- NASA
- Science and Technology Facilities Council [ST/K000861/1] Funding Source: researchfish
- STFC [ST/K000861/1] Funding Source: UKRI
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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.
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