SPIRE colour-colour diagram of 500 μm-risers, overlaid with redshift tracks of Arp220 (Rangwala et al. 2011) and Cosmic Eyelash (Swinbank et al. 2010). Galaxies selected in this work are represented with circles, while yellow shaded regions describe uncertainties related to the chosen emissivity (1.5 < β < 2.1). For comparison we show 500 μm-risers selected in different studies and with known spectroscopic redshifts. Sources marked with red stars are: z = 6.34 (HFLS3, Riechers et al. 2013), z = 6.02 (G09-8988, Zavala et al. 2018), z = 4.44 (FLS 5, Dowell et al. 2014), z = 5.3 (FLS 1, Dowell et al. 2014), z = 5.2 (HELMS-RED4, Asboth et al. 2016), z = 4.04 (GN20, Daddi et al. 2009), and z = 4.2 (SPT0113-46, Weiß et al. 2013). Sources marked with red diamonds are from Oteo et al. (2017b). For some of known sources we plot their colour uncertainties. Representative colour uncertainty for our sample is plotted in the upper-left corner.
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