Planck 2015 results
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Fig. 21


Various tracers of the interstellar medium in the hemisphere containing Loop I, with all maps centred at l = 330°, b = 0°, and using stereographic projection, so that small circles in the sky are projected as circles: a) 408 MHz; b) unsharp-mask 408 MHz; c) combined Planck-WMAP polarization intensity; d) H i at vLSR = 0, velocity width 10 km s-1, from the LAB survey (Kalberla et al. 2005); e) the same, at −10 km s-1; f) Planck 353 GHz temperature; g) Planck 353 GHz polarization intensity; h) ROSAT bands R4+R5 (0.44–1.21 keV) from Snowden et al. (1997); and i) Fermi 1–10 GeV from Ackermann et al. (2014). The dashed white outline is our proposed outer boundary, derived from panels b) and c).

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