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We revisit the galaxy cluster RXC J1504-0248, a remarkable example of astructure with a strong cool core in a near redshift ($z = 0.216$). Weperformed a combined analysis using photometric and spectroscopic data obtainedat Gemini South Telescope. We estimated the cluster mass through gravitationallensing, obtaining $M_{200} = 5.3\pm0.4 \times 10^{14}$ $h_{70}^{-1}$ M$_\odot$within $R_{200} = 1.56 \pm 0.04$ $h^{-1}_{70}$ Mpc, in agreement with a virialmass estimate. This cluster presents a prominent filamentary structureassociated to its BCG, located mainly along its major axis and aligned with theX-ray emission. A combined study of three emission line diagnostic diagrams hasshown that the filament emission falls in the so-called transition region ofthese diagrams. Consequently, several ionizing sources should be playing anmeaningful role. We have argued that old stars, often invoked to explain LINERemission, should not be the major source of ionization. We have noticed thatmost of the filamentary emission has line ratios consistent with the shockexcitation limits obtained from shock models. We also found that line fluxesare related to gas velocities (here estimated from line widths) by power-lawswith slopes in the range expected from shock models. These models also show,however, that only ~10% of H$\alpha$ luminosity can be explained by shocks. Weconclude that shocks probably associated to the cooling of the intracluster gasin a filamentary structure may indeed be contributing to the filament nebularemission, but can not be the major source of ionizing photons.

A Gemini view of the galaxy cluster RXC J1504-0248: insights on the nature of the central gaseous filaments