a) Mid-IR view of the IC 434 region. The total field-of-view is 3.1° × 2.9°. Green is the WISE-3 12 μm band; red is the WISE-4 22 μm band. b) Blown-up part of the upper image with different scaling to accentuate the extended emission around σ Ori AB. The Horsehead nebula is located at the top left. Here, blue represents Hα taken with the KPNO 4m telescope, whereas red is MIPS 24 μm emission. The KPNO image does not extend over the entire field of view but cuts off 6′ eastwards of σ Ori AB. c) Close up of the environs of σ Ori AB. Green is WISE-3, while red is MIPS 24 μm. Overplotted is the proper motion vector which displays the movement in the plane of the sky.
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