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Fig. 2

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Profiles of the simulated filament (Sect. 2.1) used to illustrate the getfilaments method. The filament has the inner half-width R0 = 37″ (at half-maximum) and the outer power-law profile Iλ(r) ∝ r-1 (blue). Gaussian-shaped sources (cyan) and background (green) have FWHM sizes of 30′′ and 4000′′, respectively. Random pixel noise (black) was convolved to a resolution of 18′′ (FWHM) and scaled to have a standard deviation σnoise = 1.25 MJy/sr (dashed). Three profiles sample the full simulated image (Fig. 3) across the top of the filament (brown), just below its midpoint (magenta), and through the position of the uppermost source (red).

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