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The cores of clusters at 0 $\lesssim$ z $\lesssim$ 1 are dominated byquiescent early-type galaxies, whereas the field is dominated by star-forminglate-type ones. Galaxy properties, notably the star formation (SF) ability, arealtered as they fall into overdense regions. The critical issues to understandthis evolution are how the truncation of SF is connected to the morphologicaltransformation and the responsible physical mechanism. The GaLAxy ClusterEvolution Survey (GLACE) is conducting a study on the variation of galaxyproperties (SF, AGN, morphology) as a function of environment in arepresentative sample of clusters. A deep survey of emission line galaxies(ELG) is being performed, mapping a set of optical lines ([OII], [OIII],H$\beta$ and H$\alpha$/[NII]) in several clusters at z $\sim$ 0.40, 0.63 and0.86. Using the Tunable Filters (TF) of OSIRIS/GTC, GLACE applies the techniqueof TF tomography: for each line, a set of images at different wavelengths aretaken through the TF, to cover a rest frame velocity range of several thousandskm/s. The first GLACE results target the H$\alpha$/[NII] lines in the clusterZwCl 0024.0+1652 at z = 0.395 covering $\sim$ 2 $\times$ r$_{vir}$. We discussthe techniques devised to process the TF tomography observations to generatethe catalogue of H$\alpha$ emitters of 174 unique cluster sources down to a SFRbelow 1 M$_{\odot}$/yr. The AGN population is discriminated using differentdiagnostics and found to be $\sim$ 37% of the ELG population. The median SFR is1.4 M$_{\odot}$/yr. We have studied the spatial distribution of ELG, confirmingthe existence of two components in the redshift space. Finally, we haveexploited the outstanding spectral resolution of the TF to estimate the clustermass from ELG dynamics, finding M$_{200}$ = 4.1 $\times$ 10$^{14}$ M$_{\odot}h^{-1}$, in agreement with previous weak-lensing estimates.

astronomy and astrophysics

GLACE survey: OSIRIS/GTC Tuneable Filter H$\alpha$ imaging of the rich  galaxy cluster ZwCl 0024.0+1652 at z = 0.395. Part I -- Survey presentation,  TF data reduction techniques and catalogue