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Turbulent structure in supernova remnants G46.8−0.3 and G39.2−0.3 from THOR polarimetry

We present the continued analysis of polarization and Faraday rotation for the supernova remnants (SNRs) G46.8−0.3 and G39.2−0.3 in L-band (1-2 GHz) radio continuum in The H i/OH/Recombination line (THOR) survey. In this work, we present our investigation of Faraday depth fluctuations from angular s...

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Main Authors: Shanahan, Russell (Author) , Stil, Jeroen M. (Author) , Anderson, Loren Dean (Author) , Beuther, Henrik (Author) , Goldsmith, Paul F. (Author) , Klessen, Ralf S. (Author) , Rugel, Michael (Author) , Soler, Juan D. (Author)
Format: Article (Journal)
Language:English
Published: 2023 October 30
In: The astrophysical journal
Year: 2023, Volume: 957, Issue: 2, Pages: 1-10
ISSN:1538-4357
DOI:10.3847/1538-4357/acfe11
Online Access:Resolving-System, kostenfrei, Volltext: https://doi.org/10.3847/1538-4357/acfe11
Verlag, lizenzpflichtig, Volltext: https://dx.doi.org/10.3847/1538-4357/acfe11
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Author Notes:Russell Shanahan, Jeroen M. Stil, Loren Anderson, Henrik Beuther, Paul Goldsmith, Ralf S. Klessen, Michael Rugel, and Juan D. Soler
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Summary:We present the continued analysis of polarization and Faraday rotation for the supernova remnants (SNRs) G46.8−0.3 and G39.2−0.3 in L-band (1-2 GHz) radio continuum in The H i/OH/Recombination line (THOR) survey. In this work, we present our investigation of Faraday depth fluctuations from angular scales comparable to the size of the SNRs down to scales less than our 16″ beam (≲0.7 pc) from Faraday dispersion (σ ϕ ). From THOR, we find median σ ϕ of 15.9 ± 3.2 rad m−2 for G46.8−0.3 and 17.6 ± 1.6 rad m−2 for G39.2−0.3. When comparing to polarization at 6 cm, we find evidence for σ ϕ ≳ 30 rad m−2 in localized regions where we detect no polarization in THOR. We combine Faraday depth dispersion with the rotation measure (RM) structure function (SF) and find evidence for a break in the SF on scales less than the THOR beam. We estimate the RM SF of the foreground interstellar medium using the SF of extragalactic radio sources and pulsars to find that the RM fluctuations we measure originate within the SNRs for all but the largest angular scales.
Item Description:Gesehen am 27.06.2024
Physical Description:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/acfe11

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