EAN: 9783319979755

LOW FREQUENCY RADIO OBSERVATIONS OF GALAXY CLUS...

This book uses new data from the very low radio frequency telescope LOFAR to analyse the
magnetic structure in the giant radio galaxy NGC6251. This analysis reveals that the magnetic
field strength in the locality of this giant radio galaxy is an order of magnitude lower than
in other comparable systems. Due to the observational limitations associated with capturing
such huge astrophysical structures  giant radio galaxies are historically a poorly sampled
population of objects  however  their preferential placement in the more rarefied regions of
the cosmic web makes them a uniquely important probe of large-scale structures. In particular 
the polarisation of the radio emissions from giant radio galaxies is one of the few tools
available to us that can be used to measure magnetic fields in regions where the strength of
those fields is a key differentiator for competing models of the origin of cosmic magnetism.
Low frequency polarisation data are crucial for detailed analyses of magnetic structure  but
they are also the most challenging type of observational data to work with. This book presents
a beautifully coupled description of the technical and scientific analysis required to extract
valuable information from such data and  as the new generation of low frequency radio
telescopes reveals the larger population of giant radio galaxies  it offers a significant
resource for future analyses.

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