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We present the Super Eight galaxies - a set of very luminous, high-redshift($7.1<z<8.0$) galaxy candidates found in Brightest of Reionizing Galaxies(BoRG) Survey fields. The original sample includes eight galaxies that are$Y$-band dropout objects with $H$-band magnitudes of $m_H<25.5$. Four of theseobjects were originally reported in Calvi et al. 2016. Combining new HubbleSpace Telescope (HST) WFC3/F814W imaging and $Spitzer$ IRAC data with archivalimaging from BoRG and other surveys, we explore the properties of thesegalaxies. Photometric redshift fitting places six of these galaxies in theredshift range of $7.1<z<8.0$, resulting in three new high-redshift galaxiesand confirming three of the four high-redshift galaxy candidates from Calvi etal. 2016. We calculate the half-light radii of the Super Eight galaxies usingthe HST F160W filter and find that the Super Eight sizes are in line withtypical evolution of size with redshift. The Super Eights have a mean mass oflog(M$_*$/M$_\odot$) $\sim10$, which is typical for sources in this luminosityrange. Finally, we place our sample on the UV $z\sim8$ luminosity function andfind that the Super Eight number density is consistent with other surveys inthis magnitude and redshift range.

The Super Eight Galaxies: Properties of a Sample of Very Bright Galaxies at $7 < z < 8$