Number of found documents: 215
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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

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
2014 - English
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. Keywords: accretion discs; black hole physics; relativistic processes Available at various institutes of the ASCR
An XSPEC model to explore spectral features from black-hle sources. II. The relativistic iron line in the lamp-post geometry

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.

Dovčiak, Michal; Svoboda, Jiří; Goosmann, R. W.; Karas, Vladimír; Matt, G.; Sochora, Vjačeslav
Astronomický ústav, 2014

On oscillations in turbulent accretion disks: I. A general approach
Horák, Jiří
2014 - English
In the article a general theory of a wave propagation in a turbulent media is reviewed. Keywords: black hole physics; accretion disks; oscillations Available at various institutes of the ASCR
On oscillations in turbulent accretion disks: I. A general approach

In the article a general theory of a wave propagation in a turbulent media is reviewed.

Horák, Jiří
Astronomický ústav, 2014

Effects of environmental drag onto a fast-moving magnetic compact star near a supermassive black hole
Karas, Vladimír; Šubr, L.; Kunneriath, Devaky; Zajaček, Michal
2014 - English
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. Keywords: accretion discs; black hole physics Available at various institutes of the ASCR
Effects of environmental drag onto a fast-moving magnetic compact star near a supermassive black hole

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.

Karas, Vladimír; Šubr, L.; Kunneriath, Devaky; Zajaček, Michal
Astronomický ústav, 2014

Revealing general relativity effects from accretion events near a supermassive black hole
Karas, Vladimír; Dovčiak, Michal; Eckart, A.; Kunneriath, Devaky; Zamaninasab, M.
2014 - English
The authors discuss the general relativity effects acting on the radiationmsignal from the inner accretion flow. Keywords: black holes; galactic center; relativity Available at various institutes of the ASCR
Revealing general relativity effects from accretion events near a supermassive black hole

The authors discuss the general relativity effects acting on the radiationmsignal from the inner accretion flow.

Karas, Vladimír; Dovčiak, Michal; Eckart, A.; Kunneriath, Devaky; Zamaninasab, M.
Astronomický ústav, 2014

Application of a sympletic integrator in a non-integrable relativistic system
Kopáček, Ondřej; Karas, Vladimír; Kovář, J.; Stuchlík, Z.
2014 - English
The authors present a detailed comparison of several integration schemes applied to the dynamic system consisting of a charged particle on the Kerr background endowed with the axisymmetric electromagnetic test field. Keywords: black hole physics; test particle dynamics; magnetic fields Available at various institutes of the ASCR
Application of a sympletic integrator in a non-integrable relativistic system

The authors present a detailed comparison of several integration schemes applied to the dynamic system consisting of a charged particle on the Kerr background endowed with the axisymmetric ...

Kopáček, Ondřej; Karas, Vladimír; Kovář, J.; Stuchlík, Z.
Astronomický ústav, 2014

Compton scattering in strong gravity
Bursa, Michal; Adámek, K.
2014 - English
The authors present new numerical code for radiation transport in strong gravity regime that includes arbitrary emission and absorption mechanisms and also electron scattering. Keywords: radiation transport; relativity; Compton scattering Available at various institutes of the ASCR
Compton scattering in strong gravity

The authors present new numerical code for radiation transport in strong gravity regime that includes arbitrary emission and absorption mechanisms and also electron scattering.

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

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