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Fig. 2.


Stereographic projection of the total gas column density, NH, derived from Planck observations of dust thermal emission (color scale). The locations of feature A, which defines the UMa arc, and features B and C are denoted. The UMa circle is shown in light gray. Left panel: positions of the UMa IVC, Draco, and Spider clouds, along with the Ursa Major and Minor constellations (in pink). Two of the lowest column density windows in the Galaxy (Lockman Hole (LH) and Groth strip (GS)) are shown. Right panel: positions of known arches and loops, in dark gray. The transition between blue and red on the false-color intensity scale corresponds to NH = 1020 cm−2.

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