Optical spectra of the nuclei of radio galaxies with radio jets

1979 ◽  
Vol 91 ◽  
pp. 257 ◽  
Author(s):  
G. K. Miley ◽  
D. E. Osterbrock
Keyword(s):  
Radio Galaxies ◽  
Optical Spectra ◽  
Radio Jets

Ultraviolet and optical spectra of broad-line radio galaxies

2008 ◽  
pp. 83-85
Author(s):  
D. Michael Crenshaw ◽  
Bradley M. Peterson ◽  
R. Mark Wagner
Keyword(s):  
Radio Galaxies ◽  
Optical Spectra ◽  
Broad Line

scholarly journals The morphological classification of distant radio galaxies explored with three-dimensional simulations

2019 ◽  
Vol 490 (1) ◽  
pp. 1363-1382 ◽  
Author(s):  
Michael D Smith ◽  
Justin Donohoe
Keyword(s):  
Radio Galaxy ◽  
Three Dimensional ◽  
Radio Galaxies ◽  
Morphological Classification ◽  
Helical Structures ◽  
Radio Jets ◽  
Source Type ◽  
Radio Lobe ◽  
Three Dimensional Simulations

ABSTRACT We explore the observational implications of a large systematic study of high-resolution three-dimensional simulations of radio galaxies driven by supersonic jets. For this fiducial study, we employ non-relativistic hydrodynamic adiabatic flows from nozzles into a constant pressure-matched environment. Synchrotron emissivity is approximated via the thermal pressure of injected material. We find that the morphological classification of a simulated radio galaxy depends significantly on several factors with increasing distance (i.e. decreasing observed resolution) and decreasing orientation often causing reclassification from FR II (limb-brightened) to FR I (limb-darkened) type. We introduce the Lobe or Limb Brightening Index (LBI) to measure the radio lobe type more precisely. The jet density also has an influence as expected with lower density leading to broader and bridged lobe morphologies as well as brighter radio jets. Hence, relating observed source type to the intrinsic jet dynamics is not straightforward. Precession of the jet direction may also be responsible for wide relaxed sources with lower LBI and FR class as well as for X-shaped and double–double structures. Helical structures are not generated because the precession is usually too slow. We conclude that distant radio galaxies could appear systematically more limb darkened due to merger-related redirection and precession as well as due to the resolution limitation.

Ultraviolet and optical spectra of broadline radio galaxies

1988 ◽  
Vol 96 ◽  
pp. 1208 ◽  
Author(s):  
D. Michael Crenshaw ◽  
Bradley M. Peterson ◽  
R. Mark Wagner
Keyword(s):  
Radio Galaxies ◽  
Optical Spectra

The optical properties of low luminosity radio galaxies with radio jets

1993 ◽  
Vol 105 ◽  
pp. 1710 ◽  
Author(s):  
J. I. Gonzalez-Serrano ◽  
R. Carballo ◽  
I. Perez-Fournon
Keyword(s):  
Optical Properties ◽  
Radio Galaxies ◽  
Radio Jets

scholarly journals The AGN fuelling/feedback cycle in nearby radio galaxies – III. 3D relative orientations of radio jets and CO discs and their interaction

2020 ◽  
Vol 499 (4) ◽  
pp. 5719-5731
Author(s):  
Ilaria Ruffa ◽  
Robert A Laing ◽  
Isabella Prandoni ◽  
Rosita Paladino ◽  
Paola Parma ◽  
...  
Keyword(s):  
Radio Galaxies ◽  
Extensive Study ◽  
3D Analysis ◽  
Very Large Array ◽  
Radio Jets ◽  
Rotation Axes ◽  
Feedback Cycle ◽  
Wide Range ◽  
Disc Rotation ◽  
First Time

ABSTRACT This is the third paper of a series exploring the multifrequency properties of a sample of eleven nearby low-excitation radio galaxies (LERGs) in the southern sky. We are conducting an extensive study of different galaxy components (stars, dust, warm and cold gas, radio jets) with the aim of better understanding the AGN fuelling/feedback cycle in LERGs. Here, we present new, deep, sub-kpc resolution Karl G. Jansky Very Large Array (JVLA) data for five sample sources at 10 GHz. Coupling these data with previously acquired Atacama Large Millimetre/submillimetre Array (ALMA) CO(2–1) observations and measurements of comparable quality from the literature, we carry out for the first time a full 3D analysis of the relative orientations of jet and disc rotation axes in six FR I LERGs. This analysis shows (albeit with significant uncertainties) that the relative orientation angles span a wide range (≈30○–60○). There is no case where both axes are accurately aligned and there is a marginally significant tendency for jets to avoid the disc plane. Our study also provides further evidence for the presence of a jet-CO disc interaction (already inferred from other observational indicators) in at least one source, NGC 3100. In this case, the limited extent of the radio jets, along with distortions in both the molecular gas and the jet components, suggest that the jets are young, interacting with the surrounding matter and rapidly decelerating.

scholarly journals On the Environments of Giant Radio Galaxies

2021 ◽  
Author(s):  
Ting-Wen Lan ◽  
J Xavier Prochaska
Keyword(s):  
Large Scale ◽  
Radio Galaxies ◽  
Sloan Digital Sky Survey ◽  
Host Galaxies ◽  
Homogeneous Sample ◽  
Large Scale Structures ◽  
Radio Jets ◽  
Sky Survey ◽  
Scale Structures ◽  
Control Samples

Abstract We test the hypothesis that environments play a key role in enabling the growth of enormous radio structures spanning more than 700 kpc, an extreme population of radio galaxies called giant radio galaxies (GRGs). To achieve this, we explore (1) the relationships between the occurrence of GRGs and the surface number density of surrounding galaxies, including satellite galaxies and galaxies from neighboring halos, as well as (2) the GRG locations towards large-scale structures. The analysis is done by making use of a homogeneous sample of 110 GRGs detected from the LOFAR Two-metre Sky Survey in combination with photometric galaxies from the DESI Legacy Imaging Surveys and a large-scale filament catalog from the Sloan Digital Sky Survey. Our results show that the properties of galaxies around GRGs are similar with that around the two control samples, consisting of galaxies with optical colors and luminosity matched to the properties of the GRG host galaxies. Additionally, the properties of surrounding galaxies depend on neither their relative positions to the radio jet/lobe structures nor the sizes of GRGs. We also find that the locations of GRGs and the control samples with respect to the nearby large-scale structures are consistent with each other. These results demonstrate that there is no correlation between the GRG properties and their environments traced by stars, indicating that external galaxy environments are not the primary cause of the large sizes of the radio structures. Finally, regarding radio feedback, we show that the fraction of blue satellites does not correlate with the GRG properties, suggesting that the current epoch of radio jets have minimal influence on the nature of their surrounding galaxies.

The Optical Spectra of Narrow-Line Radio Galaxies

1977 ◽  
Vol 211 ◽  
pp. 675 ◽  
Author(s):  
Rafael Costero ◽  
Donald E. Osterbrock
Keyword(s):  
Radio Galaxies ◽  
Optical Spectra ◽  
Narrow Line

Optical spectra of radio galaxies

1978 ◽  
Vol 220 ◽  
pp. 783 ◽  
Author(s):  
S. A. Grandi ◽  
D. E. Osterbrock
Keyword(s):  
Radio Galaxies ◽  
Optical Spectra

An Atlas of QSO Spectra

1983 ◽  
Vol 5 (1) ◽  
pp. 2-83 ◽  
Author(s):  
Belinda J. Wilkes ◽  
Alan E. Wright ◽  
David L. Jauncey ◽  
Bruce A. Peterson
Keyword(s):  
Great Majority ◽  
Radio Galaxies ◽  
Optical Spectra ◽  
Selection Effects ◽  
Bl Lac Objects ◽  
Bl Lac ◽  
Statistical Studies ◽  
Low Dispersion ◽  
Radio Survey

We present here the low-dispersion optical spectra of 295 QSO candidates. The great majority of the objects were originally selected as QSOs from the Parkes 2700 MHz radio survey, although we have also included spectra of several optically selected QSOs. A few of the QSO candidates are now better described as radio galaxies and BL Lac objects. This collection of spectra is not suitable for statistical studies unless due consideration is given to selection effects.

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