Witnessing the Formation of Galaxy Clusters: Photometric and Spectroscopic Evidence of Sub-Structures in RX J1124,3-1700 ([VMF98]102) at z~0.41
Abstract
We present a photometric and spectroscopic study of the poor cluster RX J1124,0-1700 ([VMF98]102) based on GMOS/Gemini South observations. The cluster shows a complex morphology, with a mean redshift of 0,409 and a velocity dispertion of 674,94 km/s. Using deep photometry in the r' band, we find evidence of overdensities in the projected galaxy distri- bution, showing at least three sub-structures in the cluster neighborhoods. We obtained spectral data of two of them (North and South sub-structure), showing a separation of about 2000 km/s in the cluster rest of frame. These evidences suggest that the cluster [VMF98]102 is an example of a poor cluster in process of accreting sub-structures to become a rich cluster.
FULL TEXT IN SPANISH- Publication:
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Boletin de la Asociacion Argentina de Astronomia La Plata Argentina
- Pub Date:
- 2010
- Bibcode:
- 2010BAAA...53...83N