A Survey for High-redshift Gravitationally Lensed Quasars and Close Quasar Pairs. I. The Discoveries of an Intermediately Lensed Quasar and a Kiloparsec-scale Quasar Pair at z ? 5

Abstract We present the first results from a new survey for high-redshift ( z ? 5) gravitationally lensed quasars and close quasar pairs. carry out candidate selection based on colors shapes of objects in public imaging surveys, then conduct follow-up observations to confirm nature high-priority candidates. In this paper, we report discoveries J0025–0145 = 5.07), which identify as an intermediately quasar, J2329–0522 4.85), is kiloparsec-scale pair. The Hubble Space Telescope (HST) image shows foreground lensing galaxy located 0.?6 away quasar. However, does not exhibit multiple images intermediate system (a that multiply imaged but has significant magnification). spectrum implies extreme Eddington ratio if luminosity intrinsic, could be explained by large magnification. HST also indicates tentative detection host rest-frame UV, illustrating power magnification distortion studies galaxies. Object consists two resolved components with significantly different spectral properties lack under subarcsecond seeing. it pair, highest confirmed pair date. four pairs at 2 < 4 discuss possible improvements our strategy.