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We examine the spatial extent of the narrow-line regions (NLRs) of a sampleof 30 luminous obscured quasars at $0.4 < z < 0.7$ observed with spatiallyresolved Gemini-N GMOS long-slit spectroscopy. Using the [OIII]$\lambda5007$emission feature, we estimate the size of the NLR using a cosmology-independentmeasurement: the radius where the surface brightness falls to 10$^{-15}$ ergs$^{-1}$ cm$^{-2}$ arcsec$^{-2}$. We then explore the effects of atmosphericseeing on NLR size measurements and conclude that direct measurements of theNLR size from observed profiles are too large by 0.1 - 0.2 dex on average, ascompared to measurements made to best-fit S\'{e}rsic or Voigt profilesconvolved with the seeing. These data, which span a full order of magnitude inIR luminosity ($\log{(L_{8 \mu \mathrm{m}} / \mathrm{erg\, s}^{-1})} = 44.4 -45.4$) also provide strong evidence that there is a flattening of therelationship between NLR size and AGN luminosity at a seeing-corrected size of$\sim 7$ kpc. The objects in this sample have high luminosities which placethem in a previously under-explored portion of the size-luminosityrelationship. These results support the existence of a maximal size of thenarrow-line region around luminous quasars; beyond this size either there isnot enough gas, or the gas is over-ionized and does not produce enough[OIII]$\lambda5007$ emission.

Gemini Long-slit Observations of Luminous Obscured Quasars: Further Evidence for an Upper Limit on the Size of the Narrow-Line Region