Advances in Radio Science
www.adv-radio-sci.net
1684-9965
1684-9973
5
Kleinheubacher Berichte 2006
2007
10.5194/ars-5-399-2007
http://www.adv-radio-sci.net/5/399/2007/
http://www.adv-radio-sci.net/5/399/2007/ars-5-399-2007.html
http://www.adv-radio-sci.net/5/399/2007/ars-5-399-2007.pdf
399
405
2007-06-13
Measurements of Cosmic Magnetism with LOFAR and SKA
R. Beck
rbeck@mpifr-bonn.mpg.de
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
The origin of magnetic fields in stars, galaxies and clusters is an
open problem in astrophysics. The next-generation radio telescopes
<i>Low Frequency Array (LOFAR)</i> and <i>Square Kilometre Array
(SKA)</i> will revolutionize the study of cosmic magnetism. "The
origin and evolution of cosmic magnetism" is a key science project
for SKA. The planned all-sky survey of Faraday rotation measures
(RM) at 1.4 GHz will be used to model the structure and strength of
the magnetic fields in the intergalactic medium, the interstellar
medium of intervening galaxies, and in the Milky Way. A
complementary survey of selected regions at around 200 MHz is
planned as a key project for LOFAR. <i>Spectro-polarimetry</i>
applied to the large number of spectral channels available for LOFAR
and SKA will allow to separate RM components from distinct
foreground and background regions and to perform 3-D <i>Faraday
tomography</i> of the interstellar medium of the Milky Way and nearby
galaxies. – Deep polarization mapping with LOFAR and SKA will open
a new era also in the observation of synchrotron emission from
magnetic fields. LOFAR's sensitivity will allow to map the structure
of weak, extended magnetic fields in the halos of galaxies, in
galaxy clusters, and possibly in the intergalactic medium.
Polarization observations with SKA at higher frequencies (1–10 GHz)
will show the detailed magnetic field structure within the disks and
central regions of galaxies, with much higher angular resolution
than present-day radio telescopes.
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