Revealing dusty starbursts around an X-ray emitting galaxy cluster at z=2.07

We propose HerschelSPIRE imaging of a 14.x14. field (corresponding to 7.1 Mpc x 7.1 Mpc) around the recentlydiscovered cluster CL1449+0856 at redshift z2.07. This structure is the most distant Xray luminous galaxy cluster known to date, traced by a strongoverdensity of red compact galaxies. Up to now, we securely identified 21 cluster members and our SpitzerMIPS 24micron observations reveal a very high degree of starforming activity in the cluster core. With our SPIRE imaging, we aim to reveal obscured starformation activity within and around this evolved galaxy cluster as expected around a rapidlyassembling highz halo, as already indicated by our very recently obtained APEXLABOCA imaging. We will search for massive dusty starbursts as cluster members, identify and characterize the counterparts of LABOCA SMGs, determine SEDs and dust temperatures of our sources and compare the properties of our IRbright cluster members with SMGs inblank fields. This project will push the study of massive dusty starbursts in established clusters to the highest possible redshifts. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]