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We present Subaru observations of the newly discovered luminous quasar AKARIJ1757+5907, which shows an absorption outflow in its spectrum. The absorptionconsists of 9 distinct troughs, and our analysis focuses on the troughs at ~-1000$ km s^{-1} for which we can measure accurate column densities of He I*,Fe II and Mg II. We use photoionization models to constrain the ionizationparameter, total hydrogen column density, and the number density of theoutflowing gas. These constraints yield lower limits for the distance, massflow rate and kinetic luminosity for the outflow of 3.7 kpc, 70 M_{sun}yr^{-1}, and 2.0 x 10^{43} ergs s^{-1}, respectively. Such mass flow rate valuecan contribute significantly to the metal enrichment of the intra-clustermedium. We find that this moderate velocity outflow is similar to thoserecently discovered in massive post-starburst galaxies. Finally, we describethe scientific potential of future observations targeting this object.

Outflow in Overlooked Luminous Quasar: Subaru Observations of AKARI J1757+5907