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A search is performed for the production of high-mass resonances decayinginto a photon and a jet in 3.2 fb$^{-1}$ of proton--proton collisions at acentre-of-mass energy of $\sqrt{s} = 13$ TeV collected by the ATLAS detector atthe Large Hadron Collider. Selected events have an isolated photon and a jet,each with transverse momentum above 150 GeV. No significant deviation of the$\gamma+$jet invariant mass distribution from the background-only hypothesis isfound. Limits are set at 95% confidence level on the cross sections of genericGaussian-shaped signals and of a few benchmark phenomena beyond the StandardModel: excited quarks with vector-like couplings to the Standard Modelparticles, and non-thermal quantum black holes in two models of extra spatialdimensions. The minimum excluded visible cross sections for Gaussian-shapedresonances with width-to-mass ratios of 2% decrease from about 6 fb for a massof 1.5 TeV to about 0.8 fb for a mass of 5 TeV. The minimum excluded visiblecross sections for Gaussian-shaped resonances with width-to-mass ratios of 15%decrease from about 50 fb for a mass of 1.5 TeV to about 1.0 fb for a mass of 5TeV. Excited quarks are excluded below masses of 4.4 TeV, and non-thermalquantum black holes are excluded below masses of 3.8 (6.2) TeV forRandall--Sundrum (Arkani-Hamed--Dimopoulous--Dvali) models with one (six) extradimensions.

Search for new phenomena with photon+jet events in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector