General relativistic analysis of structure and stability of charged fluid disks around compact objects

1981 ◽  
Vol 2 (1) ◽  
pp. 1-27 ◽  
Author(s):  
A. R. Prasanna ◽  
D. K. Chakraborty
Keyword(s):  
Compact Objects ◽  
Charged Fluid ◽  
Structure And Stability ◽  
General Relativistic ◽  
Fluid Disks ◽  
Relativistic Analysis

On the Possibility of the Nonexplosive Core Contraction of Massive Stars. II. General Relativistic Analysis

1999 ◽  
Vol 521 (1) ◽  
pp. 376-381 ◽  
Author(s):  
Atsuyuki Hayashi ◽  
Yoshiharu Eriguchi ◽  
Masa‐aki Hashimoto
Keyword(s):  
Massive Stars ◽  
General Relativistic ◽  
Relativistic Analysis

scholarly journals General relativistic analysis of peculiar velocities

2001 ◽  
Vol 18 (23) ◽  
pp. 5115-5123 ◽  
Author(s):  
George F R Ellis ◽  
Henk van Elst ◽  
Roy Maartens
Keyword(s):  
Peculiar Velocities ◽  
General Relativistic ◽  
Relativistic Analysis

scholarly journals Linear and circular polarization of a 1D relativistic jet model

2019 ◽  
Vol 623 ◽  
pp. A152 ◽  
Author(s):  
M. Mościbrodzka
Keyword(s):  
Black Hole ◽  
Three Dimensional ◽  
Compact Objects ◽  
Slab Geometry ◽  
Relativistic Jet ◽  
General Relativistic ◽  
Low Dimensional ◽  
Polarization Models ◽  
Radiative Transfer Equations ◽  
Relativistic Magnetohydrodynamics

Context. Polarimetric observations of black holes allow us to probe structures of magnetic fields and plasmas in strong gravity. Aims. We present a study of the polarimetric properties of a synchrotron spectrum emitted from a relativistic jet using a low-dimensional model. Methods. A novel numerical scheme is used to integrate relativistic polarized radiative transfer equations in a slab geometry where the plasma conditions change along the integration path. Results. We find that the simple model of a non-uniform jet can recover basic observational characteristics of some astrophysical sources with a relativistic jet, such as extremely high rotation measures. Our models incorporate a time-dependent component. A small fluctuation in density or temperature of the plasma along the jet produces significant amounts of fluctuations not only in the fractional linear and circular polarizations, but also in the jet internal rotation measures. Conclusions. The low-dimensional models presented here are developed within the same computational framework as the complex three-dimensional general relativistic magnetohydrodynamics simulations of black hole disks and jets, and they offer guidance when interpreting the results from more complex polarization models. The models presented here are scalable to stationary and transient polarized radio emissions produced by relativistic plasma ejected from around compact objects, in both stellar-mass and supermassive black hole systems.

scholarly journals Energy Releases from Accreting Superdense Compact Objects in AGNs

2002 ◽  
Vol 184 ◽  
pp. 371-372
Author(s):  
Avetis Abel Sadoyan
Keyword(s):  
Compact Objects ◽  
Structure And Stability ◽  
Special Cases ◽  
Centrally Symmetric ◽  
Eddington Limit ◽  
Enormous Quantity

AbstractWe consider an accreting central symmetric object that is near to the Eddington limit, i.e., the luminosity pressure is balancing the gravity. In special cases, a layer of accreting matter will be formed near the surface of a centrally symmetric object. We discuss the conditions of formation of the layer, its inner structure and stability. If the luminosity pressure will be reduced for some reason, then the layer will collapse immediately, releasing an enormous quantity (up to 1042 erg/sec) of energy. We discuss some possible scenarios for energy releases.

Oscillations of fluid disks rotating around compact objects

1991 ◽  
Vol 183 (2) ◽  
pp. 323-332 ◽  
Author(s):  
D. K. Chakraborty ◽  
K. N. Mishra
Keyword(s):  
Compact Objects ◽  
Fluid Disks

scholarly journals Iron line from neutron star accretion discs in scalar tensor theories

2020 ◽  
Vol 495 (1) ◽  
pp. L56-L60
Author(s):  
Niccolò Bucciantini ◽  
Jacopo Soldateschi
Keyword(s):  
Light Propagation ◽  
High Energy ◽  
Compact Objects ◽  
Alternative Theories Of Gravity ◽  
Iron Line ◽  
X Ray ◽  
Line Shapes ◽  
General Relativistic ◽  
Theories Of Gravity ◽  
Alternative Theories

ABSTRACT The Fe Kα fluorescent line at 6.4 keV is a powerful probe of the space–time metric in the vicinity of accreting compact objects. We investigated here how some alternative theories of gravity, namely scalar tensor theories, that invoke the presence of a non-minimally coupled scalar field and predict the existence of strongly scalarized neutron stars (NSs), change the expected line shape with respect to General Relativity. By taking into account both deviations from the general relativistic orbital dynamics of the accreting disc, where the Fe line originates, and the changes in the light propagation around the NS, we computed line shapes for various inclinations of the disc with respect to the observer. We found that both the intensity of the low-energy tails and the position of the high-energy edge of the line change. Moreover, we verified that even if those changes are in general of the order of a few percent, they are potentially observable with the next generation of X-ray satellites.

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