National Repository of Grey Literature 11 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Modified Newtonian potentials for particles and fluids in permanent rotation around black holes
Karas, Vladimír ; Abramowicz, M. A.
Modified Newtonian potentials have been proposed for the description of relativistic effects acting on particles and fluids in permanent orbital motion around black holes.
Polarization vector transport in Kerr geometry
Bursa, Michal ; Horák, Jiří ; Karssen, G.
In this paper the authors proved a set of practical formulae that are helpful in calculating the orientation of polarization vectors that are parallel transported from a region of strong gravitational field of a Kerr black hole to a distant observer.
An XSPEC model to explore spectral features from black-hle sources. II. The relativistic iron line in the lamp-post geometry
Dovčiak, Michal ; Svoboda, Jiří ; Goosmann, R. W. ; Karas, Vladimír ; Matt, G. ; Sochora, Vjačeslav
In the paper authors compare the two radial profiles of the line emission - the broken power-law dependence and illumination in the lamp-post scenario.
Twin peak quasi-periodic oscillations as signature of oscillating cusp torus
Török, G. ; Goluchová, K. ; Horák, Jiří ; Šrámková, E. ; Urbanec, M. ; Urbancová, G. ; Pecháček, Tomáš ; Bakala, P.
The authors propose a new model of twin-peak quasi-periodic oscillations.This model considers an oscillating torus with cusp that changes location of its centre around radii very close to innermost stable circular orbit.
Confronting models of twin peak quasi-periodic oscillations: Mass and spin estimates fixed by neutron star equation of state
Török, G. ; Goluchová, K. ; Urbanec, M. ; Šrámková, E. ; Adámek, K. ; Urbancová, G. ; Pecháček, Tomáš ; Bakala, P. ; Stuchlík, Z. ; Horák, Jiří ; Juryšek, J.
In the work authors compare simplified calculations that assume Kerr background geometry to the detailed calculations considering NS oblateness influence in Hartle-Thorne spacetimes.
Equilibria of charged dust tori in a dipole magnetic field: hydrodynamic approach
Slaný, P. ; Kovář, J. ; Stuchlík, Z. ; Karas, Vladimír
The authors present Newtonian model of non-conductive charge perfect fluid tori orbiting in combined spherical gravitational and dipolar magnetic fields, focusing on stationary, axisymmetric toroidal structures.
Effects of environmental drag onto a fast-moving magnetic compact star near a supermassive black hole
Karas, Vladimír ; Šubr, L. ; Kunneriath, Devaky ; Zajaček, Michal
The authors discuss whether a strong magnetic field of a neutron star can significantly enhance the drag effect by increasing the effective cross-sectional area for the mutual interaction.
Tidal disruption events from a nuclear star cluster as possible origin of transient relativistic spectral lines near SMBH
Karas, Vladimír ; Dovčiak, Michal ; Kunneriath, Devaky ; Yu, W. ; Zhang, W.
The authors discuss a possibility that a tidal disruption event near a dormant supermassive black hole can give rise to spectral features of iron in 6-7keV X-ray signal.
Triggered oscillations and destruction of magnetized relativistic tori in 2D
Hamerský, Jaroslav ; Karas, Vladimír
The toroidal magnetic field plays a more important role in the early phases of the accretion process until the perturbed configuration finds a new equilibrium or disappears because of the runaway instability. We showed that additional perturbations in the vertical direction can lead to relativistic outflows if the perturbations are strong enough so that the mass could get far from the equatorial plane.
Compton scattering in strong gravity
Bursa, Michal ; Adámek, K.
The authors present new numerical code for radiation transport in strong gravity regime that includes arbitrary emission and absorption mechanisms and also electron scattering.

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