Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1820h&link_type=abstract
ATNF proposal C1974, Semester: October, 2008
Physics
Extragalactic, Atca
Scientific paper
To explain the generation of magnetic fields in the Universe is one of the key issues for the next generation of radio telescopes. While the galactic alphaOmega-dynamo is among the favourite explanations for the large-scale magnetic field in galaxies, the observational proof is still missing. Since the presence of shear is vitally important for the working dynamo, the analysis of the magnetic field structure in the almost rigidly rotating galaxy NGC55 provides a lower limit for the efficiency of the magnetic field amplification by the dynamo. NGC55 is nearby enough to study the magnetic field structure with high spatial resolution using radio continuum polarimetry. There are archive observations at 20cm and 6cm available, which show some traces of polarization. We propose new observations at 6cm to be combined with the archive observations in order to fill up the uv-plane at the shortest baselines. Since NGC55 does not fit into the ATCA primary beam at 20cm and at 6cm, we propose additional Parkes observations, to be combined with the ATCA mosaic in order to fill up the missing zero-spacing flux. This method has been successfully demonstrated for the case of the nearby edge-on galaxy NGC253.
Dettmar Ralf-Juergen
Heesen Volker
Koribalski Baerbel
Soida Marian
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