Statistical methods for the analysis of rotation measure grids in large scale structures in the SKA era
Paper i proceeding, 2015

Determining magnetic field properties in different environments of the cosmic large-scale structure as well as their evolution over redshift is a fundamental step toward uncovering the origin of cosmic magnetic fields. Radio observations permit the study of extragalactic magnetic fields via measurements of the Faraday depth of extragalactic radio sources. Our aim is to investigate how much different extragalactic environments contribute to the Faraday depth variance of these sources. We develop a Bayesian algorithm to distinguish statistically Faraday depth variance contributions intrinsic to the source from those due to the medium between the source and the observer. In our algorithm the Galactic foreground and the measurement noise are taken into account as the uncertainty correlations of the galactic model. Additionally, our algorithm allows for the investigation of possible redshift evolution of the extragalactic contribution. This work presents the derivation of the algorithm and tests performed on mock observations. With cosmic magnetism being one of the key science projects of the new generation of radio interferometers we have made predictions for the algorithm's performance on data from the next generation of radio interferometers. Applications to real data are left for future work.

Författare

V. Vacca

Max Planck-institutet

N. Oppermann

Canadian Institute for Theoretical Astrophysics

T.A. Enßlin

Ludwig-Maximilians-Universität München

Max Planck-institutet

M. Selig

Ludwig-Maximilians-Universität München

Max Planck-institutet

H. Junklewitz

Argelander-Institut für Astronomie

M. Greiner

Ludwig-Maximilians-Universität München

Max Planck-institutet

J. Jasche

Centre national de la recherche scientifique (CNRS)

C.A. Hales

National Radio Astronomy Observatory Socorro

National Radio Astronomy Observatory

M. Reinecke

Max Planck-institutet

E. Carretti

CSIRO Astronomy and Space Science

C. Ferrari

Istituto di Radioastronomia

C. Ferrari

Université Nice Sophia Antipolis (UNS)

G. Giovannini

Universita di Bologna

Istituto di Radioastronomia

Cathy Horellou

Osservatorio Astronomico di Cagliari

Cathy Horellou

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

S. Ideguchi

University of Kumamoto

M. Johnston-Hollitt

Victoria University of Wellington

M. Murgia

Osservatorio Astronomico di Cagliari

R. Paladino

Universita di Bologna

Istituto di Radioastronomia

R. Pizzo

Netherlands Institute for Radio Astronomy (ASTRON)

A. Scaife

University of Southampton

Proceedings of Science

18248039 (eISSN)

114

Ämneskategorier

Fysik

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

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Senast uppdaterat

2018-09-07