Photometric and Spectroscopic Properties of Low X-Ray Galaxy Clusters

J.L. NILO CASTELLÓN, M.V. ALONSO,H. CUEVAS, D. GARCÍA LAMBAS ,E. R. CARRASCO, A. RAMÍREZ

Pucón, Chile

Workshop; Galaxy Clusters in the Early Universe; 2009

European Southern Observatory

We present first report of an ongoing project to study intermediate-mass systems at 0.15 < z < 0.7. We present photometric and spectroscopic proprerties of three low X-ray clusters: RX J1252.2-2920 ([VMF098]124, z~0,18 , RX J0206.4+1511 ([VMF098]022, z~0,25) and RX J1117.4+0743 ([VMF098]097, z~0,48). The clusters at lower redshifts present a clear Red Cluster Sequence (RCS) while the one at higher redshift shows no evidence of this phenomenon. From the spectroscopic analysis we see lower redshift clusters are more relaxed and [VMF098]097, at higher redshift is in process of galaxy assembly. In general, we found much more short starburst galaxies (SBB) and only a few star forming galaxies (SF) at lower redshifts, in opposition to which it is observed at higher redshifts. Future work will be focused in studyng deeply these intermediate-mass systems to disentangle the different mechanisms involve in their evolution as ram pressure, galaxy interactions, etc. and how these mechanisms contribute to the morphological galaxy evolution in these clusters.