Computer Science
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1357g&link_type=abstract
ATNF proposal C1797, Semester: April, 2008
Computer Science
Extragalactic, Atca
Scientific paper
Faraday rotation is a powerful potential probe of how magnetic fields in the Universe have evolved. In particular, a statistical ensemble of sources with both rotation measures (RMs) and redshifts can trace the evolution of galactic magnetic fields over cosmic time, because the growth in the number of expected intersections with galaxy-scale intervenors, dN/dz, should correspond to a general increase in the corresponding RMs. In a recent analysis of a large sample of extragalactic RMs, we found a reasonable indication that the distribution of RM indeed broadens with redshift. These results suggest that, remarkably, galaxies just a few Gyr old already had field strengths comparable to that seen in the Milky Way today. Here we propose to double the sample of sources with RMs at z > 1, and at the same time to extend these measurements to higher z. With these new data, we will be able to not only confirm the redshift dependence of RM suggested by existing data, but can also search for evolution of magnetic field strength as a function of time out to z ~ 4. Such a measurement can provide a direct constraint on the time scale for field amplification in the early Universe.
Gaensler Bryan
Harvey-Smith Lisa
Kronberg Philipp
Tanna Anant
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