Magnetic field and column density measured by Planck towards the region around the Vela C molecular complex. The colours represent the total column density, NH, inferred from the Planck observations (Planck Collaboration XI 2014). The “drapery” pattern, produced using the line integral convolution method (LIC, Cabral & Leedom 1993), indicates the orientation of magnetic field lines, orthogonal to the orientation of the submillimetre polarization observed by Planck at 353 GHz. The thick black polygons correspond to the cloud sub-regions as defined in Hill et al. (2011). The narrow black lines represent the 12.7, 42.4, and 84.9 counts per pixel contours in the X-ray energy band from 0.1 to 2.4 keV observed with ROSAT(Aschenbach et al. 1995).
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