Statistical tracing of magnetic fields: comparing and improving the techniques
Abstract
Magnetohydrodynamic(MHD) turbulence displays velocity anisotropies which reflect the direction of the magnetic field. This anisotropy has led to the development of a number of statistical techniques for studying magnetic fields in the interstellar medium. In this paper, we review and compare three techniques that use radio position-position-velocity data for determining magnetic field strength and morphology : the correlation function anisotropy (CFA), Principal Component Analysis of Anisotropies (PCAA), and the more recent Velocity Gradient Technique (VGT). We compare these three techniques and suggest improvements to the CFA and PCAA techniques to increase their accuracy and versatility. In particular, we suggest and successfully implement a much faster way of calculating non-periodic correlation functions for the CFA. We discuss possible improvements to the current implementation of the PCAA. We show the advantages of the VGT in terms of magnetic field tracing and stress the complementary nature with the other two techniques.
Cite
@article{arxiv.1804.02732,
title = {Statistical tracing of magnetic fields: comparing and improving the techniques},
author = {Ka Ho Yuen and Junda Chen and Yue Hu and Ka Wai Ho and A. Lazarian and Victor Lazarian and Bo Yang and Blakesley Burkhart and Caio Correia and Jungyeon Cho and Bruno Canto and J. R. De Medeiros},
journal= {arXiv preprint arXiv:1804.02732},
year = {2018}
}
Comments
18 pages, 18 figures, 3 appendices, accepted by ApJ for publication