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Multifrequency Polarimetry of the Nrao 140 Jet: Possible Detection of a Helical Magnetic Field and Constraints on its Pitch Angle
Keiichi Asada, Makoto Inoue, Masanori Nakamura +2
We present results from multifrequency polarimetry of NRAO 140 using the Very Long Baseline Array. These observations allow us to reveal the distributions of both the polarization…
Time Variation of Rotation Measure Gradient in 3C 273 Jet
Keiichi Asada, Makoto Inoue, Seiji Kameno +1
The existence of a gradient in the Faraday rotation measure (RM) of the quasar 3C 273 jet is confirmed by follow-up observations. A gradient transverse to the jet axis is seen for…
VLBI observations of the most radio-loud, narrow-line quasar SDSS J094857.3+002225
Akihiro Doi, Hiroshi Nagai, Keiichi Asada +3
We observed the narrow-line quasar SDSS J094857.3+002225, which has the highest known radio loudness for a narrow-line Seyfert~1 galaxy (NLS1), at 1.7--15.4 GHz with the Very Long…
The Kinematic and Spectral Ages of the Compact Radio Source CTD 93
Hiroshi Nagai, Makoto Inoue, Keiichi Asada +2
We present a study of the kinematic and spectral ages of the Gigahertz-Peaked Spectrum (GPS) source CTD~93. Measurements of the hot spot separation over 8.5 yr show evidence of an…
A Helical Magnetic Field in the Jet of 3C 273
Keiichi Asada, Makoto Inoue, Yutaka Uchida +4
Both in the Faraday Rotation Measure and the intrinsic polarization angle, new features are revealed to indicate a helical magnetic field operating along the jet of the bright acti…
A New Test for the Absorption Mechanism of GPS Radio Sources Using Polarization Properties
Mutsumi Mutoh, Makoto Inoue, Seiji Kameno +3
We consider the use of polarization properties as a means to discriminate between Synchrotron Self-Absorption (SSA) and Free--Free Absorption (FFA) in GHz-Peaked Spectrum (GPS) sou…