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• W3194595763 abstract "Context. H I filaments are closely related to dusty magnetized structures that are observable in the far infrared (FIR). Recently it was proposed that the coherence of oriented H I structures in velocity traces the line of sight magnetic field tangling. Aims. We study the velocity-dependent coherence between FIR emission at 857 GHz and H I on angular scales of 18′. Methods. We use HI4PI H I data and Planck FIR data and apply the Hessian operator to extract filaments. For coherence, we require that local orientation angles θ in the FIR at 857 GHz along the filaments be correlated with the H I . Results. We find some correlation for H I column densities at | v LSR | < 50 km s −1 , but a tight agreement between FIR and H I orientation angles θ exists only in narrow velocity intervals of 1 km s −1 . Accordingly, we assign velocities to FIR filaments. Along the line of sight these H I structures show a high degree of the local alignment with θ , as well as in velocity space. Interpreting these aligned structures in analogy to the polarization of dust emission defines an H I polarization. We observe polarization fractions of up to 80%, with averages of 30%. Orientation angles θ along the filaments, projected perpendicular to the line of sight, are fluctuating systematically and allow a characteristic distribution of filament curvatures to be determined. Conclusions. Local H I and FIR filaments identified by the Hessian analysis are coherent structures with well-defined radial velocities. H I structures are also organized along the line of sight with a high degree of coherence. The observed bending of these structures in the plane of the sky is consistent with models for magnetic field curvatures induced by a Galactic small-scale turbulent dynamo." @default.
• W3194595763 created "2021-08-30" @default.
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• W3194595763 date "2021-10-01" @default.
• W3194595763 modified "2023-10-11" @default.
• W3194595763 title "Local H I filaments driven by a small-scale dynamo" @default.
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• W3194595763 doi "https://doi.org/10.1051/0004-6361/202140274" @default.
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