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Many cosmological studies predict that early supermassive black holes (SMBHs)can only form in the most massive dark matter halos embedded within large scalestructures marked by galaxy over-densities that may extend up to 10 physicalMpc. This scenario, however, has not been confirmed observationally, as thesearch for galaxy over-densities around high-z quasars has returned conflictingresults. The field around the z=6.28 quasar SDSSJ1030+0524 (J1030) is uniquefor multi-band coverage and represents an excellent data legacy for studyingthe environment around a primordial SMBH. In this paper we present wide-area(25x25 arcmin), Y- and J-band imaging of the J1030 field obtained with the nearinfrared camera WIRCam at the Canada-France-Hawaii Telescope (CFHT). We builtsource catalogues in the Y- and J-band, and matched those with our photometriccatalogue in the r, z, i bands presented in Morselli et al. (2014). We usedthese new infrared data together with H and K and Spitzer/IRAC data to refineour selection of Lyman Break Galaxies (LBGs), extending our selection criteriato galaxies in the range 25.2<zAB<25.7. We selected 21 robust high-z candidatesin the J1030 field with photometric redshift around 6 and colors i-z>=1.3. Wefound a significant asymmetry in the distribution of the high-z galaxies inJ1030, supporting the existence of a coherent large-scale structure around thequasar. We compared our results with those of Bowler et al. (2015), who adoptedsimilar LBGs selection criteria, and estimated an over-density of galaxies inthe field of delta = 2.4, which is significant at >4 sigma. The over-densityvalue and its significance are higher than those found in Morselli et al.(2014), and we interpret this as evidence of an improved LBG selection.

The primordial environment of supermassive black holes (II): deep Y and J band images around the z=6.3 quasar SDSS J1030+0524