ГС

Г. С. Бисноватый-Коган

Space Research Institute

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S. G. Moiseenko

Space Research Institute

Oleg Yu. Tsupko

Goethe Institute

F. Giovannelli

Institute for Space Astrophysics and Planetology

N. V. Ardeljan

Lomonosov Moscow State University

M. V. Glushikhina

Space Research Institute

Marco Merafina

Sapienza University of Rome

R. V. E. Lovelace

Cornell University

Z. F. Seidov

Ben-Gurion University of the Negev

СИ

С. И. Блинников

Lomonosov Moscow State University

I. A. Kondratyev

Space Research Institute

Cooperative Institutions

National Institute for Astrophysics

138

Space Research Institute

Russian Academy of Sciences

Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

University of Pisa

Centre National de la Recherche Scientifique

Institute for Space Astrophysics and Planetology

Max Planck Institute for Extraterrestrial Physics

University of Geneva

Max Planck Society

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Gravitational lensing in a non-uniform plasma

Monthly Notices of the Royal Astronomical Society (2010)

Г. С. Бисноватый-Коган Oleg Yu. Tsupko

We develop a model of gravitational lensing in a non-uniform plasma. When a gravitating body is surrounded by a plasma, the lensing angle depends on the frequency of the electromagnetic wave, due to the dispersion properties of the plasma, in the presence of a plasma inhomogeneity, and of gravity. The second effect leads, even in a uniform plasma, to a difference of the gravitational photon deflection angle from the vacuum case, and to its dependence on the photon frequency. We take into account both effects, and derive the expression for the lensing angle in the case of a strongly non-uniform plasma in the presence of gravitation. The dependence of the lensing angle on the photon frequency in a homogeneous plasma resembles the properties of a refractive prism spectrometer, the strongest action of which is for very long radio waves. We discuss the observational appearance of this effect for the gravitational lens with a Schwarzschild metric, surrounded by a uniform plasma. We obtain formulae for the lensing angle and the magnification factors in this case and discuss the possibility of observation of this effect by the planned very long baseline interferometry space project RadioAstron. We also consider models with a non-uniform plasma distribution. For different gravitational lens models we compare the corrections to the vacuum lensing due to the gravitational effect in the plasma, and due to the plasma inhomogeneity. We show that the gravitational effect could be detected in the case of a hot gas in the gravitational field of a galaxy cluster.

Gravitational lensing formalism

Strong gravitational lensing

10.1111/j.1365-2966.2010.16290.x

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Citations (127)

APPROXIMATE DYNAMICS OF DARK MATTER ELLIPSOIDS

Г. С. Бисноватый-Коган Oleg Yu. Tsupko

Ellipsoid

Dynamics

10.1142/9789812834300_0402

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Numerical MHD Simulation of Laboratory Jets in a Toroidal Magnetic Field

Астрономический журнал (2023)

О. D. Toropina Г. С. Бисноватый-Коган S. G. Moiseenko

Collimated light

Toroidal and poloidal

10.31857/s0004629923010097

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Gamma-ray burst interaction with dense interstellar medium

arXiv (Cornell University) (2004)

Maxim V. Barkov Г. С. Бисноватый-Коган

Interaction of cosmological gamma ray burst radiation with the dense interstellar medium of host galaxy is considered. Gas dynamical motion of interstellar medium driven by gamma ray burst is investigated in 2D approximation for different initial density distributions of host galaxy matter and different total energy of gamma ray burst. The maximum velocity of motion of interstellar medium is $1.8\cdot10^4$ km/s. Light curves of gamma ray burst afterglow are calculated for set of non homogeneous density, distribution gamma ray burst total energy, and different viewing angles. Spectra of gamma ray burst afterglow are modeled taking into account conversion of hard photons (soft X-ray, hard UV) to soft UV and optics photons.

10.48550/arxiv.astro-ph/0410186

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Gamma-ray bursts as a manifestation of the inherent activity of neutron stars

Sov. Astron. (Engl. Transl.); (United States) (1981)

Г. С. Бисноватый-Коган В. М. Чечеткин

A model of a ..gamma..-ray burst is developed on the basis of a nuclear explosion in the envelope of a neutron star owing to a chain reaction of fission of superheavy nuclei. It is shown that most of the emission in a ..gamma..-ray burst should be thermal, but a nonthermal component and ..gamma..-ray lines can be present. The parameters of the powerful burst of March 5, 1979, are estimated on the basis of the emission spectra and the present model. The distance to the burst is < or approx. =100 pc and the total energy of the burst is < or approx. =2 x 10/sup 39/ erg.

Envelope (radar)

Source

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Accretion Disks Around Black Holes with Account of Magnetic Fields

Springer eBooks (2006)

Г. С. Бисноватый-Коган

Intermediate polar

10.1007/1-4020-4348-1_5

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Accretion Disk Models with Self-Consistent Advective Cooling and Heating

arXiv (Cornell University) (1996)

I. V. Artemova Г. С. Бисноватый-Коган G. Björnsson I. Novikov

We present solutions to the accretion disk structure equations in which advective cooling is accounted for in a self-consistent way. It is shown that for high rates of accretion, above a critical value, when without advection there are no solutions extending continuously from large to small radii, there exist global solutions with self-consistent advective cooling. These solutions are quite different fromthose solutions obtained earlier by other authors, where advective cooling was not treated self-consistently.

Accretion disc

10.48550/arxiv.astro-ph/9601008

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Collimated high-energy photons and others possible observational effects of the photon angular and spectral distribution in gamma-ray bursts sources

arXiv (Cornell University) (2004)

В. В. Соколов V. G. Kurt Г. С. Бисноватый-Коган Yu. N. Gnedin Yu. V. Baryshev

Typical observational gamma-ray burst (GRB) spectra are discussed and, in this connection, what is the origin of the compactness problem and how it was solved at first. If the threshold for $e^{-}e^{+}$ pair production depends on an angle between photon momenta, then another solution of the compactness problem is possible. We discuss a possibility of the $\gamma$-rays collimation and the dependence of photon beaming on photon energies. The list of basic assumptions of the scenario describing the GRB source with energy $< 10^{49}$ ergs are adduced: the matter is about an alternative to the ultrarelativistic fireball if {\it all} long-duration GRBs are related or physically connected with {\it normal/unpeculiar} core-collapse supernovae (SNe). Namely, we consider the questions about radiation pressure and how the jet arises on account of even small asymmetry of the radiation field in a compact GRB source. The possibility of a new approach to explanation of GRB phenomenon is shown. Possible mechanisms of their generation in regions of size $< 10^8$cm are discussed (a compact model of GRBs). Observational consequences of the compact GRB energy release are considered.

Collimated light

Spectral energy distribution

10.48550/arxiv.astro-ph/0410350

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Calculation of Thermal Conductivity Coefficients of Electrons in Magnetized Dense Matter

Plasma Physics Reports (2017)

Г. С. Бисноватый-Коган M. V. Glushikhina

10.1134/s1063780x18040013

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Citations (2)

Final Stages of Stellar Evolution