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Holm15A hosts one of the most massive back holes ever known. Hence, it isimportant to characterize any structure within its core to avoid any wrongassociation with its central black hole and, therefore, bias any future study.In this work, we present the first identification and characterization of 14structures hidden behind the surface brightness of Holm15A. We model andsubtract the spectral contribution of Holm15A to obtain the spectralinformation of these structures. We spectroscopically confirm that the 14objects found are not associated with Holm15A. Ten objects have a well-definedgalaxy spectrum from which we implement a fossil record analysis to reconstructtheir past evolution. Nine objects are candidates members to be part of acompact galaxy group at redshift 0.5814. We find past mutual interaction amongthe group candidates that support the scenario of mutual crossings.Furthermore, the fossil reconstruction of the group candidates brings evidencethat at least three different merger trees could assemble the galaxy group. Wecharacterize the properties of the galaxy group from which we estimate a lowerlimit of the scale and mass of this group. We obtain a scale of $>$146$\pm$3kpc with a dispersion velocity of 622$\pm$300 km/s. These estimations considerthe lensing effects of the gravitational potential of Holm15A. The other fiveobjects were studied individually. We use public archive data of integral fieldspectroscopic observations from the Multi-Unit Spectroscopic Explorerinstrument.

A spectroscopic study of 14 structures behind Holm15A: Detecting a galaxy group candidate at z=0.58