Casting X-rays on a blue galaxy cluster with a red spiral BCG

SDSSC4 3028 is a cluster of galaxies identified in the Sloan Digital SkySurvey. It stands out as a nearby cluster containing a surprisingly largefraction of star forming galaxies, which is not fully understood in the standardmodel of galaxy evolution. It is also very unusual that the brightest galaxy ofthis cluster is a passive red spiral galaxy. We propose an XMM pointing thatcovers the entire cluster to determine its dynamical state and to obtain a morerobust cluster mass measurement. We will also verify whether this passive redspiral galaxy is the brightest cluster galaxy residing at the the bottom of thegravitational potential of this cluster. SDSSC4 3028 provides a valuableopportunity to study the evolutionary link between galaxies and clusters. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]