Synchrotron emission from shock waves in active galactic nuclei

1987 ◽  
Vol 322 ◽  
pp. 643 ◽  
Author(s):  
P. L. Biermann ◽  
P. A. Strittmatter
Keyword(s):  
Shock Waves ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Synchrotron Emission

scholarly journals On the radio image of relativistic jets – I. Internal structure, Doppler boosting, and polarization maps

2019 ◽  
Vol 488 (1) ◽  
pp. 224-233 ◽  
Author(s):  
A V Chernoglazov ◽  
V S Beskin ◽  
V I Pariev
Keyword(s):  
Active Galactic Nuclei ◽  
Internal Structure ◽  
Linear Polarization ◽  
Ambient Pressure ◽  
Galactic Nuclei ◽  
Synchrotron Emission ◽  
Relativistic Jets ◽  
Radio Image ◽  
Radial Profiles

ABSTRACT In this first paper from forthcoming series of works devoted to radio image of relativistic jets from active galactic nuclei the role of internal structure of a flow is discussed. We determine the radial profiles of all physical values for reasonable Michel magnetization parameter σM and ambient pressure Pext. Maps of Doppler boosting factor δ and observed directions of linear polarization of synchrotron emission are also constructed.

scholarly journals The Law of Momentum Conservation and Some Problems of Metagalactic Astronomy

1972 ◽  
Vol 44 ◽  
pp. 272-276 ◽  
Author(s):  
I. S. Shklovsky
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Momentum Conservation ◽  
Positive Energy ◽  
Synchrotron Emission ◽  
Clusters Of Galaxies ◽  
Anisotropic Character ◽  
The Law ◽  
Relativistic Particles

Because of the anisotropic character of the generation of relativistic particles and synchrotron emission of active galactic nuclei and QSS it should be expected that ‘magnetoids’, the plasma bodies which are responsible for such generation, will attain large momenta. Therefore, magnetoids should be pushed out of nuclei with high velocities. This mechanism can explain several puzzling effects which are observed in the Metagalaxy, e.g. the jet in NGC 4486, connections between some galaxies and QSS and the total positive energy of some clusters of galaxies.

scholarly journals Relativistic AGN jets – III. Synthesis of synchrotron emission from double-double radio galaxies

2020 ◽  
Vol 497 (3) ◽  
pp. 3638-3657
Author(s):  
S Walg ◽  
A Achterberg ◽  
S Markoff ◽  
R Keppens ◽  
O Porth
Keyword(s):  
Magnetic Fields ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Radio Galaxies ◽  
Reference Source ◽  
Synchrotron Emission ◽  
Viewing Angle ◽  
Hydrodynamic Simulations ◽  
Ordered Fields ◽  
Double Radio Galaxies

ABSTRACT The class of double-double radio galaxies (DDRGs) relates to episodic jet outbursts. How various regions and components add to the total intensity in radio images is less well known. In this paper, we synthesize synchrotron images for DDRGs based on special relativistic hydrodynamic simulations, making advanced approximations for the magnetic fields. We study the synchrotron images for three different radial jet profiles; ordered, entangled, or mixed magnetic fields; spectral ageing from synchrotron cooling; the contribution from different jet components; the viewing angle and Doppler (de-)boosting; and the various epochs of the evolution of the DDRG. To link our results to observational data, we adopt to J1835+6204 as a reference source. In all cases, the synthesized synchrotron images show two clear pairs of hotspots, in the inner and outer lobes. The best resemblance is obtained for the piecewise isochoric jet model, for a viewing angle of approximately ϑ ∼ −71°, i.e. inclined with the lower jet towards the observer, with predominantly entangled (≳70 per cent of the magnetic pressure) in turbulent, rather than ordered fields. The effects of spectral ageing become significant when the ratio of observation frequencies and cut-off frequency νobs/ν∞, 0 ≳ 10−3, corresponding to ∼3 × 102 MHz. For viewing angles ϑ ≲ |−30°|, a DDRG morphology can no longer be recognized. The second jets must be injected within ≲ 4 per cent of the lifetime of the first jets for a DDRG structure to emerge, which is relevant for active galactic nuclei feedback constraints.

scholarly journals Strong Radio Outbursts in Six Active Galactic Nuclei in 1997-1998

1999 ◽  
Vol 194 ◽  
pp. 418-419
Author(s):  
Y.Y. Kovalev
Keyword(s):  
Active Galactic Nuclei ◽  
Physical Model ◽  
Galactic Nuclei ◽  
Physical Models ◽  
Synchrotron Emission ◽  
Relativistic Jet ◽  
Different Types ◽  
Bl Lacs

The beginnings of strong radio flares in six AGNs were detected and their evolution was studied using 1–22 GHz five epoch instantaneous spectral observations in 1997–1998. The phenomena started at the highest frequency and moved to the lower frequency in a regular fashion. Such behavior of the flares in AGNs can be explained by synchrotron emission from a compact relativistic jet implying different physical models which are discussed. For different types of AGNs the same behavior of flares is revealed, in favor of the same basic physical model for BL Lacs and quasars. A birth of new VLBI components in compact jets associated with these outbursts is predicted.

scholarly journals Parsec-Scale Synchrotron Emission from Hydrodynamic Relativistic Jets in Active Galactic Nuclei

1995 ◽  
Vol 449 (1) ◽  
Author(s):  
J. L. Gómez, ◽  
J. Ma. Martí, ◽  
A. P. Marscher, ◽  
J. Ma. Ibáñez, ◽  
J. M. Marcaide
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Synchrotron Emission ◽  
Relativistic Jets
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