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We study the origin of absorption features on the blue side of the C IV broademission line of the large-separation lensed quasar SDSS J1029+2623 at z_em ~2.197. The quasar images, produced by a foreground cluster of galaxies, have amaximum separation angle of ~ 22".5. The large angular separation suggests thatthe sight-lines to the quasar central source can go through different regionsof outflowing winds from the accretion disk of the quasar, providing a uniqueopportunity to study the structure of outflows from the accretion disk, a keyingredient for the evolution of quasars as well as for galaxy formation andevolution. Based on medium- and high-resolution spectroscopy of the twobrightest images conducted at the Subaru telescope, we find that each image hasdifferent intrinsic levels of absorptions, which can be attributed either tovariability of absorption features over the time delay between the lensedimages, ~ 774 days, or to the fine structure of quasar outflows probed by themultiple sight-lines toward the quasar. While both these scenarios areconsistent with the current data, we argue that they can be distinguished withadditional spectroscopic monitoring observations.

Spectroscopy along Multiple, Lensed Sightlines through Outflowing Winds in the Quasar SDSS J1029+2623