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 Metallicity of the high-redshift Universe traced by radio galaxies

2009 ◽  
Vol 5 (S265) ◽  
pp. 179-180
Author(s):  
K. Matsuoka ◽  
T. Nagao ◽  
R. Maiolino ◽  
A. Marconi ◽  
Y. Taniguchi
Keyword(s):  
Star Formation ◽  
High Redshift ◽  
Radio Galaxies ◽  
Narrow Line ◽  
Line Flux ◽  
Model Calculations ◽  
Massive Galaxies ◽  
High Redshift Universe ◽  
Photoionization Model ◽  
Very High

AbstractWe investigate the metallicity of the narrow line regions (NLRs) of high-z radio galaxies (HzRGs), using new deep optical spectra of 9 HzRGs obtained with FORS2 on VLT and data from the literature. To estimate the metallicity of NLRs we focus on the Civ/Heii and Ciii]/Civ flux ratios. Based on comparison between the observed emission-line flux ratios and the prediction of our photoionization model calculations, we find no significant metallicity evolution in NLRs of HzRGs, up to z ~ 4. We discuss the possibility that massive galaxies had almost completed the major epoch of the star formation in the very high-z universe (z > 5).

scholarly journals Emission-line profiles and kinematics of the narrow-line region in Seyfert and radio galaxies

1981 ◽  
Vol 247 ◽  
pp. 403 ◽  
Author(s):  
T. M. Heckman ◽  
H. R. Butcher ◽  
G. K. Miley ◽  
W. J. M. van Breugel
Keyword(s):  
Emission Line ◽  
Radio Galaxies ◽  
Narrow Line ◽  
Line Profiles ◽  
Line Region ◽  
Narrow Line Region

scholarly journals On the nature of optical nuclei in FR I radio-galaxies from ACS/HST imaging polarimetry

2007 ◽  
Vol 471 (1) ◽  
pp. 137-149 ◽  
Author(s):  
A. Capetti ◽  
D. J. Axon ◽  
M. Chiaberge ◽  
W. B. Sparks ◽  
F. Duccio Macchetto ◽  
...  
Keyword(s):  
Radio Galaxies ◽  
Imaging Polarimetry

scholarly journals Unification of Radio Galaxies

1998 ◽  
Vol 164 ◽  
pp. 81-82
Author(s):  
M.H. Cohen ◽  
P.M. Ogle ◽  
H.D. Iran ◽  
R.W. Goodrich
Keyword(s):  
Radio Galaxies ◽  
Broad Line ◽  
Narrow Line ◽  
Spectral Classification ◽  
Broad Line Region ◽  
Line Region ◽  
Direct View

AbstractMany FR 2 narrow-line radio galaxies also display polarized broad lines. The broad-line region is hidden from direct view and is seen by reflection (ie scattering). In these objects the spectral classification is controlled by the aspect at which they are viewed.

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

scholarly journals Optical, Infrared and Ultraviolet Observations of Active Nuclei

1983 ◽  
Vol 6 ◽  
pp. 443-457
Author(s):  
M.S. Longair
Keyword(s):  
Radio Galaxies ◽  
High Energy ◽  
Broad Line ◽  
Narrow Line ◽  
Bl Lac Objects ◽  
Ngc 4151 ◽  
Bl Lac ◽  
Central Energy ◽  
Ultraviolet Observations ◽  
Blue Galaxy

I have been invited to present a brief review of optical, infrared and ultraviolet observations of active nuclei. I will only describe a small sub-set of these observations, in particular those which I believe are most likely to be important in elucidating the properties of the central energy source to which we attribute the origin of all high energy phenomena. I will therefore restrict my remarks to certain aspects of BL Lac objects, optically violently variable quasars, quasars, Seyfert I galaxies and broad line radio galaxies. If we could understand these systems, we should be able to account for most other types of active nuclei, the Seyfert II galaxies, narrow line radio galaxies, all other types of Markarian galaxy, compact blue galaxy, etc. In my view, the recent observations of NGC 4151 provide us with a benchmark against which we should measure all other observations of active nuclei.

X-ray and γ-ray emissions from NLSy1 galaxies

2018 ◽  
Vol 27 (10) ◽  
pp. 1844001 ◽  
Author(s):  
V. Baghmanyan ◽  
N. Sahakyan
Keyword(s):  
Spectral Properties ◽  
Radio Galaxies ◽  
Narrow Line ◽  
High Luminosity ◽  
Large Area ◽  
X Ray ◽  
Emission Properties ◽  
Balmer Lines ◽  
Γ Ray

The recent observations by Fermi large area telescope (Fermi-LAT) showed that in addition to the radio galaxies and blazars, Narrow-Line Seyfert 1 (NLSy1) galaxies are also [Formula: see text]-rays emitters. NLSy1 are AGNs with optical spectral properties similar to those of Seyfert 1 galaxies, except for having narrow Balmer lines and strong optical lines. They also exhibit strong X-ray variability, steep X-ray spectra and relatively high luminosity. The multiwavelength emission properties of 1H 0323+342, SBS 0846+513 and PMN J0948+0022 are discussed, using the [Formula: see text]-ray data from the last 8.8 years Fermi-LAT observations as well as available Swift(UVOT/XRT) data. It is shown that one-zone synchrotron/synchrotron self-Compton (SSC) model can satisfactorily reproduce their observed broadband spectra.

scholarly journals Near-infrared Hubble Space Telescope polarimetry of a complete sample of narrow-line radio galaxies

2014 ◽  
Vol 444 (1) ◽  
pp. 466-475 ◽  
Author(s):  
E. A. Ramírez ◽  
C. N. Tadhunter ◽  
D. Axon ◽  
D. Batcheldor ◽  
C. Packham ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hubble Space Telescope ◽  
Radio Galaxies ◽  
Narrow Line ◽  
Complete Sample ◽  
Space Telescope
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