منابع مشابه
VLBI polarimetry of the high rotation measure source 3C 119 at 8.4 GHz
We have mapped the distribution of the rotation measure of the CSS source 3C 119 on milliarcsecond scales using VLBA observations obtained at three widely-separated frequencies in the available 8.4-GHz band. The resulting images at frequencies 8.16, 8.52, and 8.86 GHz demonstrate that the material associated with the large integrated rotation measure of the source is concentrated near the brigh...
متن کاملHigh Rotation Measure in the Steep Spectrum Quasar 3c 147
We present VLBA polarimetric observations of the steep-spectrum quasar 3C 147 (0538+498) made at four frequencies in the available 5-GHz band, from which we derived milliarcsecond-resolution images of the total intensity, polarization, and rotation measure distributions. The jet extending to the southwest is followed out to a distance of about 200 mas from the core. The jet shows several gentle...
متن کاملTime Variable Faraday Rotation Measures of 3c 273 & 3c 279
Multifrequency polarimetry with the VLBA confirms the previously reported timevarying Faraday rotation measure (RM) in the quasar 3C 279. Variability in the RM and electric vector position angle (EVPA) of the jet component (C4) is seen making it an unreliable absolute EVPA calibrator. 3C 273 is also shown to vary its RM structure on 1.5 year time-scales. Variation in the RM properties of quasar...
متن کاملThe Variable Rotation Measure Distribution in 3C 273 on Parsec Scales
We briefly review how opacity affects the observed polarization in synchrotron emitting jets. We show some new multi-frequency observations of 3C 273 made with the VLBA in 1999–2000, which add significantly to the available rotation measure (RM) observations of this source. Our findings can be summarized as follows: (1) The transverse gradient in RM is amply confirmed. This implies a toroidal c...
متن کاملFaraday Rotation Measure Synthesis
We extend the rotation measure work of Burn (1966) to the cases of limited sampling of λ2 space and non-constant emission spectra. We introduce the rotation measure transfer function (RMTF), which is an excellent predictor of nπ ambiguity problems with the λ coverage. Rotation measure synthesis can be implemented very efficiently on modern computers. Because the analysis is easily applied to wi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1998
ISSN: 0252-9211
DOI: 10.1017/s0252921100044742