Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-04
Astronomy and Astrophysics
Astrophysics
32 pages, 9 figures, 1 table; accepted to PASJ
Scientific paper
Highly supercritical accretion discs are probable sources of dense optically thick axisymmetric winds. We introduce a new approach based on diffusion approximation radiative transfer in a funnel geometry and obtain an analytical solution for the energy density distribution inside the wind assuming that all the mass, momentum and energy are injected well inside the spherization radius. This allows to derive the spectrum of emergent emission for various inclination angles. We show that self-irradiation effects play an important role altering the temperature of the outcoming radiation by about 20% and the apparent X-ray luminosity by a factor of 2-3. The model has been successfully applied to two ULXs. The basic properties of the high ionization HII-regions found around some ULXs are also easily reproduced in our assumptions.
Abolmasov Pavel
Karpov Sergey
Kotani Taro
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