Circular polarization of compact, extragalactic radio sources. I - Synchrotron emission and circular repolarization

1985 ◽  
Vol 297 ◽  
pp. 639 ◽  
Author(s):  
A. Y. S. Cheng ◽  
A. G. Pacholczyk ◽  
K. H. Cook
Keyword(s):  
Circular Polarization ◽  
Radio Sources ◽  
Synchrotron Emission ◽  
Extragalactic Radio Sources

scholarly journals Radio Source Evolution and Unified Schemes

1999 ◽  
Vol 16 (2) ◽  
pp. 124-129 ◽  
Author(s):  
C. A. Jackson
Keyword(s):  
Radio Source ◽  
Orientation Dependence ◽  
Observational Evidence ◽  
Line Of Sight ◽  
Radio Sources ◽  
Synchrotron Emission ◽  
Parent Population ◽  
Random Orientation ◽  
Massive Black Hole ◽  
Extragalactic Radio Sources

AbstractPowerful extragalactic radio sources are characterised by kpc-scale synchrotron emission associated with highly-collimated outflows of relativistic plasma. It is hypothesised that this outflowing plasma is powered by accretion processes concomitant with a central massive black hole. The radio morphologies of these sources comprise jets, lobes and for the most powerful sources, hotspots. At first sight, powerful extragalactic radio sources are a mixed group of objects, with the result that only some gross property delineates them further (e.g. steep-spectrum or flat-spectrum). However, there is accumulating observational evidence which suggests that it is the orientation of the radio axis to our line of sight that dictates their observed characteristics. This orientation dependence has been incorporated into ‘unified schemes’, which physically link apparently disparate radio source types via the random orientation of a ‘parent’ population on the plane of the sky. This paper summarises the ‘dual-population unified scheme’ paradigm investigated by Wall & Jackson (1997) and Jackson & Wall (1999) and discusses some of its implications with respect to radio source cosmology.

scholarly journals Comparison of Radio and Optical Polarization in Extended Extragalactic Radio Sources: II. Implications for the Magnetic Fields

1990 ◽  
Vol 140 ◽  
pp. 451-452
Author(s):  
K. Meisenheimer ◽  
H.-J. Röser
Keyword(s):  
Magnetic Fields ◽  
Radio Sources ◽  
Synchrotron Emission ◽  
Optical Polarization ◽  
Optical Studies ◽  
Extragalactic Source ◽  
Extragalactic Radio Sources ◽  
Extended Radio ◽  
Synchrotron Light

Although optical synchrotron light from an extragalactic source - the jet in M 87 - has been discovered more than 30 years ago (Baade 1956) there are still only a handful extended radio sources with established optical synchrotron emission (see Röser 1989 and references therein, also Meisenheimer et al. 1989b). We outline the relevance of optical studies and summarize some results concerning the magnetic fields in extragalactic radio sources.

Variation in the Polarization Across Bends in the Spectra of Self-Absorbed Synchrotron Sources

1972 ◽  
Vol 2 (3) ◽  
pp. 140-142 ◽  
Author(s):  
D. B. Melrose
Keyword(s):  
Circular Polarization ◽  
Low Frequency ◽  
Radio Sources ◽  
Extragalactic Radio Sources

The accepted interpretation of the low frequency turnovers in the spectra of many extragalactic radio sources is that they are due to the effects of synchrotron self-absorption, i.e. to the source becoming optically thick. It has been shown that the signs of the degrees of both linear and circular polarization for a homogeneous source at frequencies where it is optically thick are opposite to those at frequencies where it is optically thin.

Super-luminal expansion in extragalactic radio sources

Nature ◽  
1977 ◽  
Vol 267 (5608) ◽  
pp. 211-216 ◽  
Author(s):  
R. D. Blandford ◽  
C. F. McKee ◽  
M. J. Rees
Keyword(s):  
Radio Sources ◽  
Extragalactic Radio Sources

Origin of the central radio gaps in extragalactic radio sources

1992 ◽  
Vol 187 (2) ◽  
pp. 209-214 ◽  
Author(s):  
I. E. Ekejiuba ◽  
P. N. Okeke ◽  
S. E. Okoye
Keyword(s):  
Radio Sources ◽  
Extragalactic Radio Sources
Sign in / Sign up

Export Citation Format

Share Document