Radio Galaxies and Quasars

1974 ◽  
pp. 320-352 ◽  
Author(s):  
Kenneth I. Kellermann
Keyword(s):  
Radio Galaxies

3D Spectroscopy in Distant Radio Galaxies

2001 ◽  
Vol 1 ◽  
pp. 131-144
Author(s):  
B. Rocca-Volmerange
Keyword(s):  
Radio Galaxies

Ultraviolet Imaging Polarimetry of Narrow‐Line Radio Galaxies

1999 ◽  
Vol 514 (2) ◽  
pp. 579-586 ◽  
Author(s):  
Todd Hurt ◽  
Robert Antonucci ◽  
Ross Cohen ◽  
Anne Kinney ◽  
Julian Krolik
Keyword(s):  
Radio Galaxies ◽  
Narrow Line ◽  
Imaging Polarimetry

scholarly journals High-resolution VLA low radio frequency observations of the Perseus cluster: radio lobes, mini-halo, and bent-jet radio galaxies

2020 ◽  
Vol 499 (4) ◽  
pp. 5791-5805
Author(s):  
M Gendron-Marsolais ◽  
J Hlavacek-Larrondo ◽  
R J van Weeren ◽  
L Rudnick ◽  
T E Clarke ◽  
...  
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Galaxy Cluster ◽  
High Dynamic Range ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Nearby Galaxy ◽  
Cluster Galaxy ◽  
Ngc 1275 ◽  
Perseus Cluster

ABSTRACT We present the first high-resolution 230–470 MHz map of the Perseus cluster obtained with the Karl G. Jansky Very Large Array. The high dynamic range and resolution achieved have allowed the identification of previously unknown structures in this nearby galaxy cluster. New hints of sub-structures appear in the inner radio lobes of the brightest cluster galaxy NGC 1275. The spurs of radio emission extending into the outer X-ray cavities, inflated by past nuclear outbursts, are seen for the first time at these frequencies, consistent with spectral aging. Beyond NGC 1275, we also analyse complex radio sources harboured in the cluster. Two new distinct, narrowly collimated jets are visible in IC 310, consistent with a highly projected narrow-angle tail radio galaxy infalling into the cluster. We show how this is in agreement with its blazar-like behaviour, implying that blazars and bent-jet radio galaxies are not mutually exclusive. We report the presence of filamentary structures across the entire tail of NGC 1265, including two new pairs of long filaments in the faintest bent extension of the tail. Such filaments have been seen in other cluster radio sources such as relics and radio lobes, indicating that there may be a fundamental connection between all these radio structures. We resolve the very narrow and straight tail of CR 15 without indication of double jets, so that the interpretation of such head–tail sources is yet unclear. Finally, we note that only the brightest western parts of the mini-halo remain, near NGC 1272 and its bent double jets.

scholarly journals The Environment of OJ 287: Nearby Galaxies and a Long Optical Jet?

1996 ◽  
Vol 175 ◽  
pp. 47-48
Author(s):  
A. Sillanpää ◽  
L. Takalo ◽  
K. Nilsson ◽  
T. Pursimo ◽  
P. Teerikorpi ◽  
...  
Keyword(s):  
Large Scale ◽  
Radio Galaxies ◽  
Trigger Mechanism ◽  
Galaxy Clustering ◽  
Bl Lac Objects ◽  
Close Interaction ◽  
Relativistic Jet ◽  
Bl Lac ◽  
Nearby Galaxies ◽  
Bl Lacs

A widely accepted model for BL Lac objects is that they are radio galaxies with a relativistic jet pointing almost directly towards us. But we need a clear trigger mechanism for these jets. One possibility is the close interaction between the BL Lac host and the closeby galaxies (e.g. Heckman et al. 1986). This interaction has been seen many times in the case of quasars (Hutchings et al. 1989) but not so much is known about the close surroundings of the BL Lac objects although there has been some pioneer work like Stickel et al. (1993). The problem has usually been that the images are not deep enough and that the seeing has not been so good. To clarify the situation we have started an observing program to get very deep images in the sub-arcsecond seeing conditions from the whole 1 Jy sample (Stickel et al. 1991) of BL Lac objects. The aims of this study are: 1. to search for very close companions to the BL Lacs, 2. to study the large scale galaxy clustering around the BL Lacs and 3. to study the BL Lac hosts themselves.

scholarly journals Jet-torus connection in radio galaxies

2018 ◽  
Vol 609 ◽  
pp. A80 ◽  
Author(s):  
C. M. Fromm ◽  
M. Perucho ◽  
O. Porth ◽  
Z. Younsi ◽  
E. Ros ◽  
...  
Keyword(s):  
Thermal Emission ◽  
Ambient Medium ◽  
Galactic Nuclei ◽  
Radio Galaxies ◽  
Asymmetric Structures ◽  
Long Baseline ◽  
Volume Method ◽  
Index Maps ◽  
Thermal Absorption ◽  
Core Shift

Context. High resolution very long baseline interferometry observations of active galactic nuclei have revealed asymmetric structures in the jets of radio galaxies. These asymmetric structures may be due to internal asymmetries in the jets or they may be induced by the different conditions in the surrounding ambient medium, including the obscuring torus, or a combination of the two. Aims. In this paper we investigate the influence of the ambient medium, including the obscuring torus, on the observed properties of jets from radio galaxies. Methods. We performed special-relativistic hydrodynamic (SRHD) simulations of over-pressured and pressure-matched jets using the special-relativistic hydrodynamics code Ratpenat, which is based on a second-order accurate finite-volume method and an approximate Riemann solver. Using a newly developed radiative transfer code to compute the electromagnetic radiation, we modelled several jets embedded in various ambient medium and torus configurations and subsequently computed the non-thermal emission produced by the jet and thermal absorption from the torus. To better compare the emission simulations with observations we produced synthetic radio maps, taking into account the properties of the observatory. Results. The detailed analysis of our simulations shows that the observed properties such as core shift could be used to distinguish between over-pressured and pressure matched jets. In addition to the properties of the jets, insights into the extent and density of the obscuring torus can be obtained from analyses of the single-dish spectrum and spectral index maps.

scholarly journals The ionization of the emission-line gas in young radio galaxies

2009 ◽  
Vol 400 (2) ◽  
pp. 589-602 ◽  
Author(s):  
J. Holt ◽  
C. N. Tadhunter ◽  
R. Morganti
Keyword(s):  
Emission Line ◽  
Radio Galaxies

scholarly journals Lyα excess in high-redshift radio galaxies: a signature of star formation★

2007 ◽  
Vol 375 (4) ◽  
pp. 1299-1310 ◽  
Author(s):  
M. Villar-Martín ◽  
A. Humphrey ◽  
C. De Breuck ◽  
R. Fosbury ◽  
L. Binette ◽  
...  
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
Radio Galaxies

scholarly journals A study of the environments of large radio galaxies using SDSS

2012 ◽  
Vol 426 (1) ◽  
pp. 758-763 ◽  
Author(s):  
A. Pirya ◽  
D. J. Saikia ◽  
M. Singh ◽  
H. C. Chandola
Keyword(s):  
Radio Galaxies

scholarly journals X-ray emission from the nuclei, lobes and hot-gas environments of two FR II radio galaxies

2004 ◽  
Vol 353 (3) ◽  
pp. 879-889 ◽  
Author(s):  
J. H. Croston ◽  
M. Birkinshaw ◽  
M. J. Hardcastle ◽  
D. M. Worrall
Keyword(s):  
Radio Galaxies ◽  
X Ray ◽  
Hot Gas

scholarly journals A near-IR study of the host galaxies of radio-quiet quasars, radio-loud quasars and radio galaxies

1996 ◽  
Vol 283 (3) ◽  
pp. 930-968 ◽  
Author(s):  
G. L. Taylor ◽  
J. S. Dunlop ◽  
D. H. Hughes ◽  
E. I. Robson
Keyword(s):  
Radio Galaxies ◽  
Host Galaxies ◽  
Near Ir ◽  
Ir Study ◽  
Quasars And Radio Galaxies
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