The Circumgalactic Medium (CGM) corresponds to the gas surrounding galaxies and it embraces a radii of approximately 100 kpc. The CGM is a multiphase medium and a vast reservoir of baryons and heavy elements of the galaxies. Its role is very important because it manages the formation and evolution of galaxies, and provides fuel to the stars. That is why it is essential to study the CGM in order to know how galaxies evolve. In this research, we studied the circumgalactic medium of “G2”, a galaxy at z = 0.5 on the field PSZ1 G311.65–18.48 , using the “gravitational-arc tomography” technique, which means that a giant bright arc is used as a extended background source, to probe the transverse absorption around the main galaxy. This technique promises great benefits when studying the CGM, and that is the reason why we decided to study the galaxy “G2” taking advantage that in this opportunity it is located very close to a giant bright arc. In addition, We studied G2 in emission with the line OII. To do so, we made a disk model using GalPaK3D software. This software uses a data cube, in this case a MUSE data cube, to estimate a three dimensional inclined disk for a galaxy. We extracted the parameters and kinematic of the main galaxy and we extrapolated the disk model toward the arc in order to compare it with the absorption properties.