|The Australia Telescope National Facility Colloquium|
|15:00-16:00 Wed 26 Sep 2018|
Marsfield lecture theatre
(The National Radio Astronomy Observatory (NRAO))
Wide-band, High-resolution JVLA Observations of Cygnus A: Polarimetry and the value of Serendipity.
Cygnus A is the archetypal high luminosity radio galaxy. It is one of the most powerful radio galaxies known, and, at z=0.056, is located extraordinarily close to us. The source is at the center of a dense, highly magnetized X-ray emitting cluster, which has evidently retarded the expansion of its radio lobes, resulting in unusually high surface brightness. The combination of this high brightness and proximity makes this source an ideal candidate for detailed radio imaging studies. Early VLA observations, taken from the late 1970s through the early 1990s, demonstrated the presence of relativistic jets, an extraordinarily high rotation measure (RM) screen with well-defined large-scale structure, and an apparent lack of depolarization on ~0.5 arcsecond (500 pc) scale at 6cm wavelength.
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