A Survey of Orion A with XMM and Spitzer: SOXS

We propose a 530 ks Xray survey of the population of young stars embedded inthe L1641 portion of the Orion A giant molecular cloud, the closest giantmolecular cloud to the Sun. In our existing Spitzer survey of this cloud, wehave found 140 protostars and 700 young stars with disks. The Xrayobservations are the premier method of identifying the remaining young starswithout disks. With these data we can study: 1) The relative importance ofclustered and isolated star formation 2) The effect of environment on starformation and disk evolution and 3) The evolution of the Xray emitting plasmafrom the protostellar to premain sequence phase. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]