Computer Science
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atnf.prop..239g&link_type=abstract
ATNF proposal C1528, Semester: April, 2006
Computer Science
Galactic, Extragalactic, Atca
Scientific paper
The presence of coherent galactic magnetic fields points to a powerful process which organises random motions into highly-ordered structures. The dynamo is the favoured mechanism, but dynamos are not yet well understood and still face theoretical difficulties. The Milky Way is an excellent test-bed to address these issues, because it covers a sufficiently large solid angle that a huge ensemble of background rotation measures (RMs) can be used to probe the three-dimensional magnetic field structure. Indeed, RMs for pulsars and for extragalactic sources have yielded much information about the strength and orientation of fields in the Galactic plane. However, crucial new insights on Galactic magnetism can be provided by studying the magnetic field at high latitudes: such data can directly discriminate between various primordial field and dynamo models, and can clarify the role of the vertical field in transporting cosmic rays to the halo. We propose a targeted survey of the South Galactic Cap, in which we will obtain RMs for 500 highly polarized NVSS sources over 500 square degrees. Combined with a study of the North Galactic Cap with Westerbork, these data will provide a comprehensive characterisation of the Galactic magnetic field at high latitudes.
Gaensler Bryan
Haverkorn Marijke
Kronberg Phil
Madsen Greg
Mao Ann
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