Optical polarization position angle versus radio structure axis in Seyfert galaxies

Nature ◽  
1983 ◽  
Vol 303 (5913) ◽  
pp. 158-159 ◽  
Author(s):  
Robert R. J. Antonucci
Keyword(s):  
Seyfert Galaxies ◽  
Position Angle ◽  
Optical Polarization ◽  
Radio Structure

scholarly journals SEYFERT GALAXIES: NUCLEAR RADIO STRUCTURE AND UNIFICATION

2011 ◽  
Vol 731 (1) ◽  
pp. 68 ◽  
Author(s):  
Dharam V. Lal ◽  
Prajval Shastri ◽  
Denise C. Gabuzda
Keyword(s):  
Seyfert Galaxies ◽  
Radio Structure

scholarly journals Optical polarization of the Seyfert galaxies MRK 3, MRK 231, NGC 3227 and NGC 3516

1980 ◽  
Vol 192 (1) ◽  
pp. 53-74 ◽  
Author(s):  
I. Thompson ◽  
J. D. Landstreet ◽  
H. S. Stockman ◽  
J. R. P. Angel ◽  
E. A. Beaver
Keyword(s):  
Seyfert Galaxies ◽  
Optical Polarization

scholarly journals Long-Term Polarization Changes of 88 Her

1987 ◽  
Vol 92 ◽  
pp. 200-201 ◽  
Author(s):  
J. Arsenijević ◽  
S. Jankov ◽  
G. Djurašević
Keyword(s):  
Spectral Region ◽  
Early Period ◽  
Position Angle ◽  
Optical Polarization ◽  
Intrinsic Polarization ◽  
The Mean ◽  
Linear Optical

AbstractLinear optical polarization of 88 Her has been measured in V spectral region during the period 1974–1985. The mean annual values of the intrinsic polarization parameters are presented. The polarization percentage changes from 0.15%(1976) to 0.56%(1979). Small values of the polarization percentage correspond to the period when the envelope effect is negligible. The maximum of polarization percentage has been found during the early period of strong shell phase. The polarization position angle varies between 53 and 83 degrees.

scholarly journals The Brightness and Polarization Structure of Compact Radio Sources

1988 ◽  
Vol 129 ◽  
pp. 161-162
Author(s):  
Raymond Rusk
Keyword(s):  
Position Angle ◽  
Active Galaxies ◽  
Radio Sources ◽  
Optical Polarization ◽  
Polarization Data ◽  
Core Component ◽  
Structural Position ◽  
Bl Lac Objects ◽  
The Core ◽  
Bl Lac

New VLA polarization data for 140 radio sources have been used to study the correlation between VLBI structural position angle and radio and optical polarization position angles reported in Rusk and Seaquist (1985). We confirm that there is a strong tendency, in active galaxies and quasars, for the radio E vector (of the core component) to lie normal to the VLBI structural axis. However, in BL Lac objects we find a tendency for the core radio E vector to be aligned parallel to the VLBI structural axis.

scholarly journals The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN

2020 ◽  
Vol 499 (3) ◽  
pp. 3149-3157
Author(s):  
E Congiu ◽  
P Kharb ◽  
A Tarchi ◽  
M Berton ◽  
A Caccianiga ◽  
...  
Keyword(s):  
Position Angle ◽  
Optical Observations ◽  
Narrow Line ◽  
Radio Structure ◽  
Long Baseline ◽  
New Radio ◽  
The Galaxy ◽  
L Band ◽  
Very Long Baseline Array ◽  
Band Image

ABSTRACT In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. $1.6\, \mathrm{GHz}$ observations performed with the e-MERLIN interferometer confirm the presence of the diffuse emission previously observed. The Very Long Baseline Array (VLBA) also detects the nuclear source both at $1.6\, \mathrm{GHz}$ (L band) and $5\, \mathrm{GHz}$ (C band). While the L-band image shows only an unresolved core, the C-band image shows the presence of a partially resolved structure at a position angle of 60○. The brightness temperature of the emission in both bands (${\gt}10^6\, \mathrm{K}$) suggests that it is a pc-scale jet produced by the active galactic nucleus. The relatively steep VLBA spectral index (αVLBA = 0.63 ± 0.03) is consistent with the presence of optically thin emission on milliarcsecond scales. Finally, we investigated two possible scenarios that can result in the misalignment between the kpc and pc-scale radio structure detected in the galaxy. We also analysed the optical morphology of the galaxy, which suggests that Mrk 783 underwent a merging in relatively recent times.

scholarly journals SS433: Periodic Changes in the Radio Structure of Scale Size 1016 cm

1982 ◽  
Vol 97 ◽  
pp. 207-208
Author(s):  
A. E. Niell ◽  
T. G. Lockhart ◽  
R. A. Preston ◽  
D. C. Backer
Keyword(s):  
Position Angle ◽  
Optical Observations ◽  
Propagation Time ◽  
Radio Structure ◽  
Scale Size ◽  
Time Out ◽  
Half Angle ◽  
The Mean ◽  
Orientation Parameters ◽  
Periodic Changes

Radio observations have clearly demonstrated that the kinematic twin-jet model (Milgrom 1979; Abell and Margon 1979) is the correct description of the general behavior of SS433 and have determined the orientation parameters that could not be obtained from the optical observations (Gilmore and Seaquist 1980; Hjellming and Johnston 1981 (HJ); Niell, Lockhart, and Preston 1981 (NLP)). Figure 1 shows the observed position angle of the radio jet at a distance of approximately from the core during the period 1979 May to 1981 May as determined from our VLBI measurements at 2.3 GHz. The mean position angle is 98°±2° for a 20° half-angle cone of precession about an inclination of 79° to the line of sight. The phase is consistent with the expected propagation time out to (1016cm) at a speed of 0.26c for a distance to SS433 of 5 kiloparsecs (HJ; NLP).

scholarly journals Interstellar polarization and the position-angle orientations of type 1 Seyfert galaxies

2005 ◽  
Vol 363 (4) ◽  
pp. 1241-1246 ◽  
Author(s):  
Jennifer L. Hoffman ◽  
Ryan Chornock ◽  
Douglas C. Leonard ◽  
Alexei V. Filippenko
Keyword(s):  
Seyfert Galaxies ◽  
Position Angle

Radio Structure of Seyfert Galaxies

1980 ◽  
pp. 161-163
Author(s):  
A. S. Wilson ◽  
A. G. Willis
Keyword(s):  
Seyfert Galaxies ◽  
Radio Structure
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