Results 181 to 190 of about 5,357 (210)
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Astrophysics and Space Science, 1994
Observations on parsec scales suggest that the flow in extra-galactic radio sources has both bulk and thermal Lorentz factors which are significantly greater than one. Using a simple transformation of variable, Chiu (1973) demonstrated that the dynamical equations for a relativistic, nondegenerate fluid (Synge (1957)), can be expressed in a form which ...
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Observations on parsec scales suggest that the flow in extra-galactic radio sources has both bulk and thermal Lorentz factors which are significantly greater than one. Using a simple transformation of variable, Chiu (1973) demonstrated that the dynamical equations for a relativistic, nondegenerate fluid (Synge (1957)), can be expressed in a form which ...
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Stability of three-dimensional relativistic jets: implications for jet collimation [PDF]
Astronomy and Astrophysics, 2010 The stable propagation of jets in FRII sources is remarkable if one takes into account that large-scale jets are subjected to potentially highly disruptive three-dimensional (3D) Kelvin-Helmholtz instabilities.
M Perucho, J M Marti, JOSÉ Maria Cela
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ON MAGNETIC SELF-COLLIMATION OF RELATIVISTIC JETS
International Journal of Modern Physics D, 2010We present a semi-analytical model using the equations of general relativistic magnetohydrodynamics (GRMHD) for jets emitted by a rotating black hole. We assume steady axisymmetric outflows of a relativistic ideal fluid in Kerr metrics. We express the conservation equations in the frame of the FIDucial Observer (FIDO or ZAMO) using a 3+1 space–time ...
Globus, Noemie +2 more
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Science, 1982
A variety of recent optical, radio, and x-ray observations have confirmed the hypothesis that the peculiar star SS 433 is ejecting two narrow, opposed, highly collimated jets of matter at one-quarter the speed of light. This unique behavior is probably driven by mass exchange between a relatively normal star and a compact companion, either a neutron ...
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A variety of recent optical, radio, and x-ray observations have confirmed the hypothesis that the peculiar star SS 433 is ejecting two narrow, opposed, highly collimated jets of matter at one-quarter the speed of light. This unique behavior is probably driven by mass exchange between a relatively normal star and a compact companion, either a neutron ...
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Stability of a Relativistic Half-Jet
The Physics of Fluids, 1967The stability of an inviscid compressible relativistic half-jet is considered. Linearized disturbance equations are obtained for three-dimensional, infinitesimal, wavy disturbances superimposed on the main flow and the eigenvalue problem is investigated numerically for the case of two-dimensional disturbances.
Lessen, M., Zien, H. M.
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Relativistic Jet Formation in Microquasars
Astrophysics and Space Science, 2001Microquasars produce collimated, relativistic flow at speeds up to a Lorentz factor of ∼ 3 (0.94c). It is generally believed that such flow velocities indicate that jet acceleration and collimation occurs in the relativistic environment of a supermassive black hole.
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New Astronomy Reviews, 1998
Abstract We discuss the structure and relativistic kinematics that develop in three spatial dimensions when a moderately hot, supersonic jet propagates into a denser background medium and encounters resistance from an oblique magnetic field. Our simulations incorporate relativistic MHD in a four-dimensional spacetime and clearly show that (a ...
K.-I. Nishikawa +6 more
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Abstract We discuss the structure and relativistic kinematics that develop in three spatial dimensions when a moderately hot, supersonic jet propagates into a denser background medium and encounters resistance from an oblique magnetic field. Our simulations incorporate relativistic MHD in a four-dimensional spacetime and clearly show that (a ...
K.-I. Nishikawa +6 more
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Extragalactic relativistic jets
Proceedings of the International Astronomical Union, 2018AbstractRelativistic jets are one of the most powerful manifestations of the release of energy produced around supermassive black holes at the centre of active galactic nuclei (AGN). Their emission is observed across the entire electromagnetic spectrum, from the radio band to gamma rays.
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Relativistic MHD Simulations of Relativistic Jets with RAISHIN
AIP Conference Proceedings, 2007We have performed numerical simulations of weakly and strongly magnetized relativistic jets embedded in a weakly and strongly magnetized stationary or mildly relativistic (0.5c) sheath using the RAISHIN code. In the numerical simulations a jet with Lorentz factor γ = 2.5 is processed to break the initial equilibrium configuration.
Y. Mizuno +3 more
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Relativistic jets in the universe
New Astronomy Reviews, 2003Abstract Relativistic outflows are a common phenomenon in accreting black holes. Despite the enormous differences in scale, stellar-mass black holes in X-ray binaries and collapsars, and super-massive black holes at the dynamic centre of galaxies are sources of jets with analogous physical properties.
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