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Limits on thickness and efficiency of Polish doughnuts in application to the ULX sources
Maciek Wielgus, Wenchi Yan, Jean-Pierre Lasota +1
Polish doughnuts (PDs) are geometrically thick disks that rotate with super-Keplerian velocities in their innermost parts, and whose long and narrow funnels along rotation axes col…
Levitating atmospheres of Eddington-luminosity neutron stars
Maciek Wielgus, Aleksander Sadowski, Wlodek Kluzniak +2
We construct models of static, spherically symmetric shells supported by the radiation flux of a luminous neutron star in the Schwarzschild metric. The atmospheres are disconnected…
Stable, levitating, optically thin atmospheres of Eddington-luminosity neutron stars
M. Wielgus, W. Kluźniak, A. Sądowski +2
In general relativity static gaseous atmospheres may be in hydrostatic balance in the absence of a supporting stellar surface, provided that the luminosity is close to the Eddingto…
Stress-energy tensor of a radiating sphere inclosing black hole
Maciek Wielgus, Marek A. Abramowicz
We consider a uniformly luminous radiating sphere and a static black hole located in the center of that sphere. We give analytic formulas for radiation stress-energy tensor compone…