Number of found documents: 231
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Equilibria of charged dust tori in a dipole magnetic field: hydrodynamic approach
Slaný, P.; Kovář, J.; Stuchlík, Z.; Karas, Vladimír
2014 - English
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. Keywords: dust tori; electric charge; magnetic field Available at various institutes of the ASCR
Equilibria of charged dust tori in a dipole magnetic field: hydrodynamic approach

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 ...

Slaný, P.; Kovář, J.; Stuchlík, Z.; Karas, Vladimír
Astronomický ústav, 2014

Polarization vector transport in Kerr geometry
Bursa, Michal; Horák, Jiří; Karssen, G.
2014 - English
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. Keywords: polarization; black hole; electromagnetic radiation Available at various institutes of the ASCR
Polarization vector transport in Kerr geometry

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 ...

Bursa, Michal; Horák, Jiří; Karssen, G.
Astronomický ústav, 2014

An Introduction to relativistic magnetohydrodynamics. II. Case of stationary electro-vacuum fields around black holes
Karas, Vladimír
2014 - English
The lecture on electrodynamical effects near black holes. The author summarize the basic equations of relativistic electrodynamics in terms of spin-coefficien formalism. Keywords: black holes; electromagnetic fields; relativity Available at various institutes of the ASCR
An Introduction to relativistic magnetohydrodynamics. II. Case of stationary electro-vacuum fields around black holes

The lecture on electrodynamical effects near black holes. The author summarize the basic equations of relativistic electrodynamics in terms of spin-coefficien formalism.

Karas, Vladimír
Astronomický ústav, 2014

Simulating Compton scattering using Monte Carlo method: COSMOC library
Adámek, K.; Bursa, Michal
2014 - English
The authors present properties and functionality of the COSMOC library designed to exploit basic features of Compton scattering process and its computational modelling. Keywords: Monte Carlo; Compton scattering; C++ Available at various institutes of the ASCR
Simulating Compton scattering using Monte Carlo method: COSMOC library

The authors present properties and functionality of the COSMOC library designed to exploit basic features of Compton scattering process and its computational modelling.

Adámek, K.; Bursa, Michal
Astronomický ústav, 2014

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.
2014 - English
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. Keywords: accretion discs; black hole physics Available at various institutes of the ASCR
Tidal disruption events from a nuclear star cluster as possible origin of transient relativistic spectral lines near SMBH

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.

Karas, Vladimír; Dovčiak, Michal; Kunneriath, Devaky; Yu, W.; Zhang, W.
Astronomický ústav, 2014

Modelling steep radial emissivity in relativistic iron lines from black-hole accretion discs
Svoboda, Jiří; Dovčiak, Michal; Karas, Vladimír; Goosmann, R. W.
2014 - English
The authors discuss whether the special conditions on the corona properties are indeed required, and/or whether the steep radial emissivity could be an artefact of model assumptions. Keywords: black holes; accretion discs; relativistic iron lines Available at various institutes of the ASCR
Modelling steep radial emissivity in relativistic iron lines from black-hole accretion discs

The authors discuss whether the special conditions on the corona properties are indeed required, and/or whether the steep radial emissivity could be an artefact of model assumptions.

Svoboda, Jiří; Dovčiak, Michal; Karas, Vladimír; Goosmann, R. W.
Astronomický ústav, 2014

Triggered oscillations and destruction of magnetized relativistic tori in 2D
Hamerský, Jaroslav; Karas, Vladimír
2014 - English
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. Keywords: accretion discs; black hole physics Available at various institutes of the ASCR
Triggered oscillations and destruction of magnetized relativistic tori in 2D

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 ...

Hamerský, Jaroslav; Karas, Vladimír
Astronomický ústav, 2014

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.
2014 - English
In the work authors compare simplified calculations that assume Kerr background geometry to the detailed calculations considering NS oblateness influence in Hartle-Thorne spacetimes. Keywords: X-rays binaries; accretion discs; equation of state Available at various institutes of the ASCR
Confronting models of twin peak quasi-periodic oscillations: Mass and spin estimates fixed by neutron star equation of state

In the work authors compare simplified calculations that assume Kerr background geometry to the detailed calculations considering NS oblateness influence in Hartle-Thorne spacetimes.

Török, G.; Goluchová, K.; Urbanec, M.; Šrámková, E.; Adámek, K.; Urbancová, G.; Pecháček, Tomáš; Bakala, P.; Stuchlík, Z.; Horák, Jiří; Juryšek, J.
Astronomický ústav, 2014

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.
2014 - English
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. Keywords: X-rays binaries; accretion discs; equation of state Available at various institutes of the ASCR
Twin peak quasi-periodic oscillations as signature of oscillating cusp torus

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 ...

Török, G.; Goluchová, K.; Horák, Jiří; Šrámková, E.; Urbanec, M.; Urbancová, G.; Pecháček, Tomáš; Bakala, P.
Astronomický ústav, 2014

Modified Newtonian potentials for particles and fluids in permanent rotation around black holes
Karas, Vladimír; Abramowicz, M. A.
2014 - English
Modified Newtonian potentials have been proposed for the description of relativistic effects acting on particles and fluids in permanent orbital motion around black holes. Keywords: accretion discs; black hole physics Available at various institutes of the ASCR
Modified Newtonian potentials for particles and fluids in permanent rotation around black holes

Modified Newtonian potentials have been proposed for the description of relativistic effects acting on particles and fluids in permanent orbital motion around black holes.

Karas, Vladimír; Abramowicz, M. A.
Astronomický ústav, 2014

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