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Galactic outflows are thought to eject baryons back out to thecircum-galactic medium (CGM). Studies based on metal absorption lines (MgII inparticular) in the spectra of background quasars indicate that the gas isejected anisotropically, with galactic winds likely leaving the host in abi-conical flow perpendicular to the galaxy disk. In this paper, we present adetailed analysis of an outflow from a z = 0.7 "green-valley" galaxy(log($M_*$/$\mathrm{M}_\odot$) = 9.9; SFR = 0.5$\mathrm{M}_\odot\,\mathrm{yr}^{-1}$) probed by two background sources part ofthe MUSE Gas Flow and Wind (MEGAFLOW) survey. Thanks to a fortuitousconfiguration with a background quasar (SDSSJ1358+1145) and a bright backgroundgalaxy at $z = 1.4$, both at impact parameters of $\approx 15\,\mathrm{kpc}$,we can - for the first time - probe both the receding and approachingcomponents of a putative galactic outflow around a distant galaxy. We measure asignificant velocity shift between the MgII absorption from the two sightlines($84\pm17\,\mathrm{km}\,\mathrm{s}^{-1}$), which is consistent with theexpectation from our simple fiducial wind model, possibly combined with anextended disk contribution.

MusE GAs FLOw and Wind (MEGAFLOW) IV: A two sightline tomography of a galactic wind