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Surprising evolution of the parsec-scale faraday rotation gradients in the jet of the bl lac object (2009).
| Content Provider | CiteSeerX |
|---|---|
| Abstract | Several multi-frequency polarization studies have shown the presence of systematic Faraday Rotation gradients across the parsec-scale jets of Active Galactic Nuclei (AGN), taken to be due to the systematic variation of the line-of-sight component of a helical magnetic (B) field across the jet. Other studies have confirmed the presence and sense of these gradients in several sources, thus providing evidence that these gradients persist over time and over large distances from the core. However, we find surprising new evidence for a reversal in the direction of the Faraday Rotation gradient across the jet of B1803+784, for which multi-frequency polarization observations are available at four epochs. At our three epochs and the epoch of Zavala & Taylor (2003), we observe transverse Rotation Measure (RM) gradients across the jet, consistent with the presence of a helical magnetic field wrapped around the jet. However, we also observe a “flip ” in the direction of the gradient between June 2000 and August 2002. Although the origins of this phenomena are not |
| File Format | |
| Publisher Date | 2009-01-01 |
| Access Restriction | Open |
| Subject Keyword | Bl Lac Object Parsec-scale Faraday Rotation Gradient Surprising Evolution Parsec-scale Jet Line-of-sight Component Zavala Taylor Active Galactic Nucleus Systematic Variation Multi-frequency Polarization Observation Several Source Helical Magnetic Large Distance Surprising New Evidence Faraday Rotation Gradient Helical Magnetic Field Systematic Faraday Rotation Gradient Transverse Rotation Measure Several Multi-frequency Polarization Study |
| Content Type | Text |
