tokens: the 2 level in the Y and J bands, consistent with the measured magnitudes in the HST /WFC3 imaging. To determine the photometry and colour of the Pop III/DCBH candidate, we measured photometry on the ground-based imaging centred on the position of component A using small circular apertures of 1.2arcsec in diameter. We also measured the photometry in larger apertures of 2arcsec in diameter to compare directly with the results of S15 , and using a diameter of 3arcsec to provide a more appropriate measure of the total flux. The larger apertures were centred on the peak of the Y J UltraVISTA image, which is offset by 0.35arcsec to the north-west of component A (the stamps shown in Fig. 1 are centred on this position). The results are shown in Table 1 . All photometry was corrected to total magnitudes assuming a point-source correction. 2 S15 found a strong excess in the J -band photometry for CR7 using the UltraVISTA DR2 data, when the continuum level was derived from fitting to the Y , H and K s bands. The observed offset of m AB 0.4 0.13mag was interpreted as the contribution to the measured photometry from the spectroscopically observed He ii emission line. Converting the J -band excess into an estimated rest-frame equivalent width, S15 inferred an equivalent width of EW 0 80 20 for the He ii line. Table 1. The measured photometry for CR7 utilizing deeper near-infrared data from UltraVISTA DR3 and mid-infrared imaging from the SPLASH survey. The upper part of the table shows the available HST and Spitzer photometry. For the full object photometry, labelled as component Full, the photometry was measured in 3-arcsec-diameter circular apertures on the HST /WFC3 data, and the Spitzer /IRAC photometry was obtained using a deconfusion analysis based on the UltraVISTA K s -band data. The lower part of the table shows the ground-based photometry measured in 1.2-, 2.0- and 3-arcsec-diameter circular apertures. Note that the aperture photometry has been corrected to total assuming a point-source correction. The final row of the table reproduces the photometry and value as measured in S15 . Using the deeper near-infrared imaging now available, we find a smaller J -band excess than that determined in S15 , with for the 1.2-arcsec-diameter measurement. Here, the continuum level was determined from the best-fitting Bruzual Charlot ( 2003 ) SED to the Y , H , K s and [3.6] bands with the redshift fixed to z 6.6 (as shown in Fig. 2 ). If, instead, the continuum level in the J band is determined from a power-law fit to the Y , H and K s bands, we find an excess of . An offset of 0.2mag was also found using the two larger aperture measurements, and the results are unchanged if point spread function (PSF) homogenized images are used. To understand the differences between our results and those of S15 , we compared photometric catalogues from the older DR2 data used by S15 to those from the DR3 data. In the four bands, we find no significant zero-point offset
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