Robitaille, J-F;
Scaife, AMM;
Carretti, E;
Gaensler, BM;
McEwen, JD;
Leistedt, B;
Haverkorn, M;
... Staveley-Smith, L; + view all
(2017)
A new perspective on turbulent Galactic magnetic fields through comparison of linear polarization decomposition techniques.
Monthly Notices of the Royal Astronomical Society
, 468
(3)
pp. 2957-2974.
10.1093/mnras/stx642.
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Abstract
We compare two rotationally invariant decomposition techniques on linear polarization data: the spin-2 spherical harmonic decomposition in two opposite parities, the E- and B-mode, and the multiscale analysis of the gradient of linear polarization, |∇ P|. We demonstrate that both decompositions have similar properties in the image domain and the spatial frequency domain. They can be used as complementary tools for turbulence analysis of interstellar magnetic fields in order to develop a better understanding of the origin of energy sources for the turbulence, the origin of peculiar magnetic field structures and their underlying physics. We also introduce a new quantity |∇EB| based on the E- and B-modes and we show that in the intermediate- and small-scale limit |∇EB| |∇ P|. Analysis of the 2.3 GHz S-band Polarization All Sky Survey shows many extended coherent filament-like features appearing as ‘double jumps’ in the |∇ P| map that are correlated with negative and positive filaments of B-type polarization. These local asymmetries between the two polarization types, E and B, of the non-thermal Galactic synchrotron emission have an influence on the E- and B-mode power spectra analyses. The wavelet-based formalism of the polarization gradient analysis allows us to locate the position of E- or B-mode features responsible for the local asymmetries between the two polarization types. In analysed subregions, the perturbations of the magnetic field are trigged by star clusters associated with H II regions, the Orion–Eridanus superbubble and the North Polar Spur at low Galactic latitude.
| Type: | Article |
|---|---|
| Title: | A new perspective on turbulent Galactic magnetic fields through comparison of linear polarization decomposition techniques |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx642 |
| Publisher version: | http://doi.org/10.1093/mnras/stx642 |
| Language: | English |
| Additional information: | © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, techniques: image processing, ISM: general, ISM: magnetic fields, ISM: structure, radio continuum: ISM, DELTA-VARIANCE METHOD, CMB POLARIZATION, INTERSTELLAR TURBULENCE, RADIO-POLARIZATION, MOLECULAR CLOUDS, GRAVITY-WAVES, SOUTHERN SKY, PLANE, GRADIENTS, EMISSION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1552561 |
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