An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations

Basu A, Fletcher A, Mao SA, Burkhart B, Beck R, Schnitzeler D (2019)
GALAXIES 7(4): 89.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Basu, AritraUniBi; Fletcher, Andrew; Mao, Sui Ann; Burkhart, Blakesley; Beck, Rainer; Schnitzeler, Dominic
Abstract / Bemerkung
In this paper, we present a detailed analysis of the Faraday depth (FD) spectrum and its clean components obtained through the application of the commonly used technique of Faraday rotation measure synthesis to analyze spectro-polarimetric data. To directly compare the Faraday depth spectrum with physical properties of a magneto-ionic medium, we generated synthetic broad-bandwidth spectro-polarimetric observations from magnetohydrodynamic (MHD) simulations of a transonic, isothermal, compressible turbulent medium. We find that correlated magnetic field structures give rise to a combination of spiky, localized peaks at certain FD values, and broad structures in the FD spectrum. Although most of these spiky FD structures appear narrow, giving an impression of a Faraday thin medium, we show that they arise from strong synchrotron emissivity at that FD. Strong emissivity at a FD can arise because of both strong spatially local polarized synchrotron emissivity at a FD or accumulation of weaker emissions along the distance through a medium that have Faraday depths within half the width of the rotation measure spread function. Such a complex Faraday depth spectrum is a natural consequence of MHD turbulence when the lines of sight pass through a few turbulent cells. This therefore complicates the convention of attributing narrow FD peaks to the presence of a Faraday-rotating medium along the line of sight. Our work shows that it is difficult to extract the FD along a line of sight from the Faraday depth spectrum using standard methods for a turbulent medium in which synchrotron emission and Faraday rotation occur simultaneously.
Stichworte
galactic magnetic fields; polarimetry; magneto-hydrodynamics simulations
Erscheinungsjahr
2019
Zeitschriftentitel
GALAXIES
Band
7
Ausgabe
4
Art.-Nr.
89
eISSN
2075-4434
Page URI
https://pub.uni-bielefeld.de/record/2940099

Zitieren

Basu A, Fletcher A, Mao SA, Burkhart B, Beck R, Schnitzeler D. An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations. GALAXIES. 2019;7(4): 89.
Basu, A., Fletcher, A., Mao, S. A., Burkhart, B., Beck, R., & Schnitzeler, D. (2019). An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations. GALAXIES, 7(4), 89. doi:10.3390/galaxies7040089
Basu, A., Fletcher, A., Mao, S. A., Burkhart, B., Beck, R., and Schnitzeler, D. (2019). An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations. GALAXIES 7:89.
Basu, A., et al., 2019. An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations. GALAXIES, 7(4): 89.
A. Basu, et al., “An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations”, GALAXIES, vol. 7, 2019, : 89.
Basu, A., Fletcher, A., Mao, S.A., Burkhart, B., Beck, R., Schnitzeler, D.: An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations. GALAXIES. 7, : 89 (2019).
Basu, Aritra, Fletcher, Andrew, Mao, Sui Ann, Burkhart, Blakesley, Beck, Rainer, and Schnitzeler, Dominic. “An In-Depth Investigation of Faraday Depth Spectrum Using Synthetic Observations of Turbulent MHD Simulations”. GALAXIES 7.4 (2019): 89.

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