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We demonstrate that the UV brightest quasars at z=1-2 live in overdenseenvironments. This is based on an analysis of deep Hubble Space Telescope WFC3G141 grism spectroscopy of the galaxies along the lines-of-sight to UV luminousquasars in the redshift range z=1-2. This constitutes some of the deepest grismspectroscopy performed by WFC3, with 4 roll angles spread over a year ofobservations to mitigate the effect of overlapping spectra. Of the 12 quasarfields studied, 8 display evidence for a galaxy overdensity at the redshift ofthe quasar. One of the overdensities, PG0117+213 at z=1.50, has potentially 36spectroscopically confirmed members, consisting of 19 with secure redshifts and17 with single-line redshifts, within a cylinder of radius ~700 kpc. Its halomass is estimated to be log (M/Msol)=14.7. This demonstrates that spectroscopicand narrow-band observations around distant UV bright quasars may be anexcellent route for discovering protoclusters. Our findings agree with previoushints from statistical observations of the quasar population and theoreticalworks, as feedback regulated black hole growth predicts a correlation betweenquasar luminosity and halo mass. We also present the high signal-to-noiserest-frame optical spectral and photometric properties of the quasarsthemselves.

Quasar Sightline and Galaxy Evolution (QSAGE) survey -- II. Galaxy overdensities around UV luminous quasars at z=1-2