scholarly journals A Study of 13 Powerful Classical Double Radio Galaxies

2008 ◽  
Vol 174 (1) ◽  
pp. 74-110 ◽  
Author(s):  
P. Kharb ◽  
C. P. O’Dea ◽  
S. A. Baum ◽  
R. A. Daly ◽  
M. P. Mory ◽  
...  
Keyword(s):  
Radio Galaxies ◽  
Double Radio Galaxies

Constraints on extragalactic-jet characteristics from lobe observations

1986 ◽  
Vol 64 (4) ◽  
pp. 378-380 ◽  
Author(s):  
Steven R. Spangler
Keyword(s):  
Hot Spot ◽  
Radio Galaxies ◽  
Large Array ◽  
Very Large Array ◽  
Upper Limits ◽  
Measured Speed ◽  
High Mach ◽  
Jet Characteristics ◽  
Double Radio Galaxies ◽  
Spot Motion

We discuss Very Large Array spectral and polarimetric observations of the lobes of luminous, double radio galaxies. These observations can provide information on the (typically undetected) jets responsible for the sources. Spectral steepening is usually observed in the lobes, with the radio spectral index increasing with distance from the hot spot. These data can be used to infer a "speed of separation" of the hot spot and lobe material. These speeds, typically 1.0 × 104–3.0 × 104 km/s, are in agreement with hydrocode models of jets, which interpret the measured speed of separation as a combination of hot-spot motion and backflow. Polarimetric observations indicate that in at least some sources, there is an undetectably small amount of internal Faraday rotation, indicating upper limits to the thermal-plasma density of a few times 10−5 cm−3 or less. These measurements are also in agreement with the numerical beam models, provided that the beam density is substantially less than that of the background medium. We conclude that the lobe observations indicate that these sources are powered by light, high-Mach-number beams.

scholarly journals A low-frequency study of recently identified double-double radio galaxies

2019 ◽  
Vol 486 (4) ◽  
pp. 5158-5170 ◽  
Author(s):  
S Nandi ◽  
D J Saikia ◽  
R Roy ◽  
P Dabhade ◽  
Y Wadadekar ◽  
...  
Keyword(s):  
Low Frequency ◽  
Radio Galaxies ◽  
Double Radio Galaxies

scholarly journals Double-double radio galaxies: further insights into the formation of the radio structures

2010 ◽  
Vol 410 (1) ◽  
pp. 484-498 ◽  
Author(s):  
C. Brocksopp ◽  
C. R. Kaiser ◽  
A. P. Schoenmakers ◽  
A. G. de Bruyn
Keyword(s):  
Radio Galaxies ◽  
Double Radio Galaxies

scholarly journals The Milliarcsecond Structure of Radio Galaxies and Quasars

1982 ◽  
Vol 97 ◽  
pp. 279-288 ◽  
Author(s):  
A.C.S. Readhead ◽  
T. J. Pearson
Keyword(s):  
Radio Galaxies ◽  
Compact Sources ◽  
Double Radio Galaxies

Hybrid maps of the nuclei of radio galaxies and quasars show a variety of morphologies. Among compact sources, two structures are common: an asymmetric, “core-jet” morphology (eg, 3C 273), and an “equal double” morphology with two separated, similar components (eg, CTD 93). The nuclei of extended, double radio galaxies generally have a core-jet morphology with the jet directed toward one of the outer components.

scholarly journals The extended radio structures of quasars and radio galaxies

1986 ◽  
Vol 119 ◽  
pp. 189-190
Author(s):  
J.P. Leahy ◽  
P.W. Stephens ◽  
T.W.B. Muxlow
Keyword(s):  
Radio Galaxies ◽  
Systematic Variation ◽  
Extended Radio ◽  
Bridge Structures ◽  
Quasars And Radio Galaxies ◽  
Double Radio Galaxies ◽  
Radio Power

We have observed 20 classical double radio galaxies and quasars with MERLIN at 151 MHz. We discuss the systematic variation of the bridge structures with radio power and the nature of the identification.

scholarly journals Using data mining to find bent-double radio galaxies in the FIRST survey

2001 ◽  
Author(s):  
Chandrika Kamath ◽  
Erick Cantu-Paz ◽  
Imola K. Fodor ◽  
Nu A. Tang
Keyword(s):  
Data Mining ◽  
Radio Galaxies ◽  
Using Data ◽  
Double Radio Galaxies
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