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We present the largest systematic, HST-based search to date for luminous$z\gtrsim8$ galaxy candidates using $\sim$1267 arcmin$^{2}$ of (pure-)parallelobservations from a compilation of 288 random sightlines with ACS and WFC3observations, derived from the SuperBoRG data set and together representing afactor $\sim1.12\times$ larger than existing space-based data sets. Using NIRcolor cuts and careful photo-$z$ analyses, we find 31 $z\gtrsim8$ galaxycandidates over 29 unique sightlines, and derive global galaxy properties suchas UV magnitudes and continuum slopes, sizes, and rest-frame optical properties(e.g., SFRs, stellar masses, $A_{\rm v}$). Taking advantage of the(pure-)parallel nature of our data set - making it one of the mostrepresentative thus far - and derived SFRs, we evaluate the cosmic starformation rate density for the bright end of the UV luminosity function at$z\sim8-10$ and test the validity of luminosity function-derived results usinga conversion factor. We find our method yields comparable results to thosederived with luminosity functions. Furthermore, we present follow upobservations of 5 (Super)BoRG targets with Keck/MOSFIRE, finding no evidence ofLy$\alpha$ in $>3$ hrs of $Y-$band observations in either, consistent with alargely neutral medium at $z\sim8$. Our results offer a definitive HST legacyon the bright end of the luminosity function and provide a valuable benchmarkas well as targets for follow up with JWST.

astrophysical journal/the astrophysical journal

The Physical Properties of Luminous $z\gtrsim8$ Galaxies and  Implications for the Cosmic Star Formation Rate Density From $\sim$0.35  deg$^{2}$ of (Pure-)Parallel HST Observations