Left: SPIRE 3-colour image of one Planck high-z overdensity candidate (located in the centre), in an image covering about 20′ × 20′. We note the bluer source on the left (circled), which corresponds to the galaxy cluster shown on the right. Right: a confirmed z = 1.58 galaxy cluster XMMU J0044.0-2033 (Santos et al. 2011) which lies close to our Planck high-z source. The background image is a two colour composite of Spitzer-IRAC channel 1 (3.6μm) and channel 2 (4.5μm), covering about 3′ × 2′. The contours are Herschel-SPIRE 350μm. See Sect. 6.1 for details.
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