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Triggered oscillations and destruction of magnetized relativistic tori in 2D
Hamerský, Jaroslav; Karas, Vladimír
2014 - anglický
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.
Klíčová slova:
accretion discs; black hole physics
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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 ...
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 - anglický
In the work authors compare simplified calculations that assume Kerr background geometry to the detailed calculations considering NS oblateness influence in Hartle-Thorne spacetimes.
Klíčová slova:
X-rays binaries; accretion discs; equation of state
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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.
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 - anglický
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.
Klíčová slova:
X-rays binaries; accretion discs; equation of state
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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 ...
Modified Newtonian potentials for particles and fluids in permanent rotation around black holes
Karas, Vladimír; Abramowicz, M. A.
2014 - anglický
Modified Newtonian potentials have been proposed for the description of relativistic effects acting on particles and fluids in permanent orbital motion around black holes.
Klíčová slova:
accretion discs; black hole physics
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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.
On oscillations in turbulent accretion disks: I. A general approach
Horák, Jiří
2014 - anglický
In the article a general theory of a wave propagation in a turbulent media is reviewed.
Klíčová slova:
black hole physics; accretion disks; oscillations
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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.
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 - anglický
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.
Klíčová slova:
accretion discs; black hole physics
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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.
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 - anglický
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.
Klíčová slova:
accretion discs; black hole physics; relativistic processes
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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.
Variace geoidu detekované z družicové mise GRACE
Kostelecký, J.; Bezděk, Aleš; Klokočník, Jaroslav
2014 - český
Časově proměnné gravitační pole, získané z pozorování mise GRACE od roku 2002, je v tomto příspěvku založené na transformaci měsíčních gravitačních polích na výšku geoidu. Ukážeme gravitační změny působené globálním hydrologickým cyklem a hydrologií na pevninách. Time variability of the gravity field, provided by the GRACE mission since 2002, presented here is based on the transformation of monthly gravity field models to the geoid. We show the changes caused by the global water cycle and land hydrology.
Klíčová slova:
GRACE mission; geoid; gravimetry
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Variace geoidu detekované z družicové mise GRACE
Časově proměnné gravitační pole, získané z pozorování mise GRACE od roku 2002, je v tomto příspěvku založené na transformaci měsíčních gravitačních polích na výšku geoidu. Ukážeme gravitační změny ...
Revealing general relativity effects from accretion events near a supermassive black hole
Karas, Vladimír; Dovčiak, Michal; Eckart, A.; Kunneriath, Devaky; Zamaninasab, M.
2014 - anglický
The authors discuss the general relativity effects acting on the radiationmsignal from the inner accretion flow.
Klíčová slova:
black holes; galactic center; relativity
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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.
Application of a sympletic integrator in a non-integrable relativistic system
Kopáček, Ondřej; Karas, Vladimír; Kovář, J.; Stuchlík, Z.
2014 - anglický
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.
Klíčová slova:
black hole physics; test particle dynamics; magnetic fields
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
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 ...
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