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We study the geometry and the internal structure of the outflowing wind fromthe accretion disk of a quasar by observing multiple sightlines with the aid ofstrong gravitational lensing. Using Subaru/HDS, we performed high-resolution($R$ $\sim$ 36,000) spectroscopic observations of images A and B of thegravitationally lensed quasar SDSS J1029+2623 (at $z_{em}$ $\sim$ 2.197) whoseimage separation angle, $\theta$ $\sim$ 22$^{\prime\prime}\!\!$.5, is thelargest among those discovered so far. We confirm that the difference inabsorption profiles in the images A and B discovered by Misawa et al. (2013)remains unchanged since 2010, implying the difference is not due to timevariability of the absorption profiles over the delay between the images,$\Delta t$ $\sim$ 744 days, but rather due to differences along the sightlines.We also discovered time variation of C IV absorption strength in both images Aand B, due to change of ionization condition. If a typical absorber's size issmaller than its distance from the flux source by more than five orders ofmagnitude, it should be possible to detect sightline variations among images ofother smaller separation, galaxy-scale gravitationally lensed quasars.

Resolving the Clumpy Structure of the Outflow Winds in the Gravitationally Lensed Quasar SDSS J1029+2623