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We present a spectroscopic analysis of two galaxy clusters out to ~4Mpc atz~0.2. The two clusters VMF73 and VMF74 identified by Vikhlinin et al. (1998)were observed with MOSCA at the Calar Alto 3.5m telescope. Both clusters lie inthe ROSAT PSPC field R285 and were selected from the X-ray Dark Cluster Survey(Gilbank et al. 2004) that provides optical V- and I-band data. VMF73 and VMF74are located at respective redshifts of z=0.25 and z=0.18 with velocitydispersions of 671 km/s and 442 km/s, respectively. The spectroscopicobservations reach out to ~2.5 virial radii. Line strength measurements of theemission lines H_alpha and [OII]3727 are used to assess the star formationactivity of cluster galaxies which show radial and density dependences. Themean and median of both line strength distributions as well as the fraction ofstar forming galaxies increase with increasing clustercentric distance anddecreasing local galaxy density. Except for two galaxies with strong H_alphaand [OII] emission, all of the cluster galaxies are normal star forming orpassive galaxies. Our results are consistent with other studies that show thetruncation in star formation occurs far from the cluster centre.Comment: 15 pages, 12 figures. A&A in pres

Star formation activity of intermediate redshift cluster galaxies out to the infall regions