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Large scale magnetic fields in galaxies at high redshifts

Published online by Cambridge University Press:  17 September 2012

M.L. Bernet ,
F. Miniati ,
S.J. Lilly ,
P.P. Kronberg  and
M. Dessauges-Zavadsky
M.L. Bernet
Affiliation:
Institute for Astronomy, ETH Zurich, 8093 Zurich, Switzerland. e-mail: [email protected];
F. Miniati
Affiliation:
Institute for Astronomy, ETH Zurich, 8093 Zurich, Switzerland. e-mail: [email protected];
S.J. Lilly
Affiliation:
Institute for Astronomy, ETH Zurich, 8093 Zurich, Switzerland. e-mail: [email protected];
P.P. Kronberg
Affiliation:
Los Alamos National Laboratory, PO Box 1663, Los Alamos NM 87545, USA
M. Dessauges-Zavadsky
Affiliation:
Observatoire de Genève, 51 Ch. Des Mailletes, 1290 Sauverny, Switzerland
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Abstract

In a recent study we have used a large sample of extragalactic radio sources to investigate the redshift evolution of the Rotation Measure (RM) of polarized quasars up to z ≈ 3.0. We found that the dispersion in the RM distribution of quasars increases at higher redshifts and hypothesized that MgII intervening systems were responsible for the observed trend. To test this hypothesis, we have recently obtained high-resolution UVES/VLT spectra for 76 quasars in our sample and in the redshift range 0.6 < z < 2.0. We found a clear correlation between the presence of strong MgII systems and large RMs. This implies that normal galaxies at z ≈ 1 already had large-scale magnetic fields comparable to those seen today.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 109 - 112
Copyright
© EAS, EDP Sciences, 2012

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References

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