Molecular gas in star-forming galaxies of the intermediate redshift cluster Zw Cl0024+1652

We present preliminary results from a survey of cold gas in an intermediate-redshift cluster, Zw Cl0024.1+1652 at z = 0.395, using the EMIR instrument at the IRAM-30m telescope, Pico Veleta observatory, Sierra Nevada, Spain. We observed the CO 2-1 and 1-0 transitions in a sample of seven star-forming galaxies drawn out of the GLACE catalogue of H-alpha+[NII] emission-line galaxies. These galaxies have been chosen to be bright in far-IR and to span a wide range of local densities/cluster-centric distances. We have derived the L'_CO luminosity (tracing the amount of cold gas available for star formation) and combined these data with the L_TIR data (tracing the SFR) derived by our team, and with additional CO and FIR data from literature to study how the amount of cold gas in an intermediate-redshift cluster relates to the SFR and cluster-centric distance. The results suggest that, at a given SFR, the reservoir of cold gas is smaller in cluster galaxies. Furthermore, there are also hints that the amount of cold gas increases with the cluster-centric distance, hence pointing to an environmental dependency