SPIRE images of NGC 891 at 250 (left), 350 (centre), 500 μm (right). Each panel shows an area of 14′ × 28′ centred on the galaxy’s radio continuum coordinates , (J2000.0; Oosterloo et al. 2007). The main beam size is indicated by the filled circle (FWHM: 181, 249, and 364). Images have pixel sizes of 6, 8, 12″ at 250, 350, and 500 μm, respectively (i.e. about 1/3 of the measured FWHM). The crossed lines in the 500 μm image show the scan directions. The sky rms noise is σ = 0.74, 0.44, and 0.23 MJy sr-1, from 250 to 500 μm. Contours are shown at 3, 10, 100, 200-σ over all images, at 500-σ in the 250 and 350 μm map, at 1000-σ only in the 250 μm map. North is up, east to the left.
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