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We present the pilot study component of the Fluorescent Lyman-AlphaStructures in High-z Environments (FLASHES) Survey; the largest integral-fieldspectroscopy survey to date of the circumgalactic medium at $z=2.3-3.1$. Weobserved 48 quasar fields between 2015 and 2018 with the Palomar Cosmic WebImager (Matuszewski et al. 2010). Extended HI Lyman-$\mathrm{\alpha}$ emissionis discovered around 42/48 of the observed quasars, ranging in projected,flux-weighted radius from 21-71 proper kiloparsecs (pkpc), with 26 nebulaeexceeding $100\mathrm{~pkpc}$ in effective diameter. The circularly averagedsurface brightness radial profile peaks at a maximum of $\mathrm{1\times10^{-17}~erg~s^{-1}~cm^{-2}~arcsec^{-2}}$($2\times10^{-15}~\mathrm{erg~s^{-1}~cm^{-2}~arcsec^{-2}}$ adjusted forcosmological dimming) and luminosities range from$1.9\times10^{43}~\mathrm{erg~s^{-1}}$ to$-14.1\times10^{43}~\mathrm{erg~s^{-1}}$. The emission appears to have a highlyeccentric morphology and a maximum covering factor of $50\%$ ($60\%$ for giantnebulae). On average, the nebular spectra are red-shifted with respect to boththe systemic redshift and Ly$\alpha$ peak of the quasar spectrum. Theintegrated spectra of the nebulae mostly have single or double-peaked lineshapes with global dispersions ranging from $167~\mathrm{km~s^{-1}}$ to$690~\mathrm{km~s^{-1}}$, though the individual (Gaussian) components of lineswith complex shapes mostly appear to have dispersions $\leq 400$$\mathrm{km~s^{-1}}$, and the flux-weighted velocity centroids of the linesvary by thousands of $ \mathrm{km~s^{-1}}$ with respect to the systemic QSOredshifts. Finally, the root-mean-square velocities of the nebulae are found tobe consistent with gravitational motions expected in dark matter halos of mass$\mathrm{M_h \simeq10^{12.5} M_\odot}$. We compare these results to existingsurveys at both higher and lower redshift.

The FLASHES Survey I: Integral Field Spectroscopy of the CGM around 48 $z=2.3-3.1$ QSOs