We know from direct
and indirect observations that magnetic fields exist in the Universe.
However, in many instances we do not know their exact strength and
orientation. Dr Melanie Johnston-Hollitt is interested in cosmic
magentic fields as derived through the Faraday Rotation
measures of Extra-galactic background sources. In particular, she is
interested in two key research areas:
The Galactic
Magnetic Field
Using the extra-galactic rotation measures available in the literature
we aim to study the large-scale structure of the magentic field of the
Milky Way. So far this has provided information on the extent of the
Galactic magnetic field and some information on the structures within
it.
Magnetic Fields in
Galaxy Clusters
Galaxy clusters are the most masive bound objects in the Universe. In
recent years, it has become clear through radio and X-ray observations
that siginigicant magnetic fields exist, at least at locally dynamic
regions (relics, halos, x-ray cold fronts) in galaxy clusters. Our work
involves examining the statistical properties of the large-scale
magnetic fields in clusters via Faraday rotation measures of both
background and embedded objects.
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Dr
Melanie Johnston-Hollitt:
Collaborators:
Prof R.D. Ekers (ATNF, Australia)
C.P. Hollitt (Adelaide, Australia)
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Intraday Variability