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Gravitational lensing sometimes dominates the observed properties ofapparently very bright objects. We present morphological properties in thehigh-resolution (FWHM $\sim0.''15$) Atacama Large Millimeter/submillimeterArray (ALMA) 1-mm map for an ultra-luminous quasar (QSO) at $z=6.30$, SDSSJ010013.02+280225.8 (hereafter J0100+2802), whose black hole mass $M_{\rm BH}$is the most massive ($\sim$ 1.2$\times10^{10}M_{\odot}$) at $z>6$ ever known.We find that the continuum emission of J0100+2802 is resolved into a quadruplesystem within a radius of $0.''2$, which can be interpreted as either multipledusty star-forming regions in the host galaxy or multiple images due to stronggravitational lensing. The Mg$_{\rm II}$ absorption and the potentialLy$\alpha$ line features have been identified at $z=2.33$ in the near-infraredspectroscopy towards J0100+2802, and a simple mass model fitting wellreproduces the positions and flux densities of the quadruple system, both ofwhich are consistent with the latter interpretation. Although a high-resolutionmap taken in the Advanced Camera for Survey (ACS) on board Hubble SpaceTelescope (HST) shows a morphology with an apparently single component, in ourfiducial lens mass model it can simply be explained by a $\sim50$ pc scaleoffset between the ALMA and HST emission regions. In this case, themagnification factor for the observed HST emission is obtained to $\sim450$,reducing the intrinsic $M_{\rm BH}$ estimate to even below $10^{9}\,M_{\odot}$.The confirmation or the rejection of the gravitational lensing scenario isimportant for our understanding of the super-massive black holes in the earlyUniverse.

Truth or delusion? A possible gravitational lensing interpretation of the ultra-luminous quasar SDSS J010013.02+280225.8 at $z=6.30$