SIMBAD references

2014MNRAS.438L..51M - Mon. Not. R. Astron. Soc., 438, L51-L55 (2014/February-2)

Broad absorption features in wind-dominated ultraluminous X-ray sources ?

MIDDLETON M.J., WALTON D.J., ROBERTS T.P. and HEIL L.

Abstract (from CDS):

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.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): accretion, accretion discs - black hole physics - X-rays: binaries

Simbad objects: 5

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2020.09.28-17:54:47

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