Massive Star Forming Spirals as Brightest Cluster Galaxies

Brightest Cluster Galaxies (BCGs) residing in the hearts of galaxy clusters aremassive ellipticals with little star formation. A recent study hinted thatmassive, blue, starforming galaxies (super spirals) may be the BCGs ofseveral galaxy clusters. Clearly, such a BCG population would be at odds withour understanding about the formation of these galaxies. However, based on thepresently available data it could not be unequivocally demonstrated that superspirals are truly BCGs. Therefore, we request exploratory XMMNewtonobservations to map the morphology of the intracluster medium, measure theoffsets between the peak of the diffuse Xray emission and the position of thecandidate BCGs, and hence directly probe if super spirals are true BCGs. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]