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 Institut fur Astrophysik
N. Oppermann
Canadian Institute for Theoretical Astrophysics
T.A. Enßlin
Ludwig-Maximilians-Universitat Munchen
Max Planck Institut fur Astrophysik
M. Selig
Max Planck Institut fur Astrophysik
Ludwig-Maximilians-Universitat Munchen
H. Junklewitz
Argelander-Institut Für Astronomie
M. Greiner
Max Planck Institut fur Astrophysik
Ludwig-Maximilians-Universitat Munchen
J. Jasche
CNRS Centre National de la Recherche Scientifique
C.A. Hales
National Radio Astronomy Observatory Socorro
National Radio Astronomy Observatory
M. Reinecke
Max Planck Institut fur Astrophysik
E. Carretti
CSIRO Astronomy and Space Science
C. Ferrari
Istituto Di Radioastronomia, Bologna
C. Ferrari
Universite Nice Sophia Antipolis
G. Giovannini
Alma Mater Studiorum Universita di Bologna
Istituto Di Radioastronomia, Bologna
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
Istituto Di Radioastronomia, Bologna
Alma Mater Studiorum Universita di Bologna
R. Pizzo
Netherlands Foundation for Research in Astronomy
A. Scaife
University of Southampton
Proceedings of Science
18248039 (eISSN)
114Ämneskategorier (SSIF 2011)
Fysik
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper