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Red quasars may represent a young stage of galaxy evolution that provideimportant feedback to their host galaxies. We are studying a population ofextremely red quasars (ERQs) with exceptionally fast and powerful outflows, atmedian redshift $z$ = 2.6. We present Keck/KCWI integral field spectra of 11ERQs, which have a median color $i-W3$ = 5.9~mag, median $\left\langleL_{\text{bol}} \right\rangle$ $\approx$ 5 $\times$ $10^{47}$ erg s$^{-1}$,Ly$\alpha$ halo luminosity $\left\langle L_{\text{halo}} \right\rangle$ $=$ 5$\times$ $10^{43}$ erg s$^{-1}$, and maximum linear size $>128$ kpc. The ERQhalos are generally similar to those of blue quasars, following known trendswith $L_{\text{bol}}$ in halo properties. ERQs have halo symmetries similar toType-I blue quasars, suggesting Type-I spatial orientations. ERQ $\left\langleL_{\text{halo}} \right\rangle$ is $\sim$2 dex below blue quasars, which ismarginal due to scatter, but consistent with obscuration lowering photon escapefractions. ERQ halos tend to have more compact and circularly symmetric innerregions than blue quasars, with median exponential scale lengths of $\sim$9kpc, compared to $\sim$16 kpc for blue quasars. When we include the centralregions not available in blue quasar studies (due to PSF problems), the truemedian ERQ halo scale length is just $\sim$6 kpc. ERQ halos are alsokinematically quiet, with median velocity dispersion 293 km s$^{-1}$,consistent with expected virial speeds. Overall we find no evidence forfeedback on circumgalactic scales, and the current episode of quasar activity,perhaps due to long outflow travel times, has not been around long enough toaffect the circumgalactic medium. We confirm the narrow Ly$\alpha$ emissionspikes found in ERQ aperture spectra are halo features, and are useful forsystemic redshifts and measuring outflow speeds in other features.

Compact and Quiescent Circumgalactic Medium and Ly$\alpha$ Halos around Extremely Red Quasars (ERQs)