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We report the discovery of a spectroscopically-confirmed strongLyman-$\alpha$ emitter at $z=7.0281\pm0.0003$, observed as part of theReionization Cluster Lensing Survey (RELICS). This galaxy, dubbed "DichromaticPrimeval Galaxy" at $z\sim7$ (DP7), shows two distinct components. While fairlyunremarkable in terms of its ultraviolet (UV) luminosity($\sim0.3L^{\ast}_{UV}$, where $L^{\ast}_{UV}$ is the characteristicluminosity), DP7 has one of the highest observed Lyman-$\alpha$ equivalentwidths (EWs) among Lyman-$\alpha$ emitters at $z>6$ ($>200$ Angstrom in therest frame). The strong Lyman-$\alpha$ emission generally suggests a youngmetal-poor, low-dust galaxy; however, we find that the UV slope $\beta$ of thegalaxy as a whole is redder than typical star-forming galaxies at theseredshifts, $-1.13\pm 0.84$, likely indicating, on average, a considerableamount of dust obscuration, or an older stellar population. When we measure$\beta$ for the two components separately, however, we find evidence ofdiffering UV colors, suggesting two separate stellar populations. Also, we findthat Lyman-$\alpha$ is spatially extended and likely larger than the galaxysize, hinting to the possible existence of a Lyman-$\alpha$ halo. Rejuvenationor merging events could explain these results. Either scenario requires anextreme stellar population, possibly including a component of Population IIIstars, or an obscured Active Galactic Nucleus. DP7, with its low UV luminosityand high Lyman-$\alpha$ EW, represents the typical galaxies that are thought tobe the major contribution to the reionization of the Universe, and for thisreason DP7 is an excellent target for follow-up with the James Webb SpaceTelescope.

RELICS-DP7: Spectroscopic Confirmation of a Dichromatic Primeval Galaxy at z ~ 7