The figure shows a CO map of TMC (after Mizuno et al. 1995) with the fields of view of the XMM-Newton exposures overplotted (dashed: archival). Symbols: +              T Tau stars X             class I protostars o              HH objects filled o     brown dwarfs. Exposures outside this map: L1551 T Tau HH355F

Accompanying surveys of TMC with the Canada-French-Hawaii Telescope (CFHT) obtain very deep Halpha, R, andt I band surveys from CFH12K (performed). A MEGACAM optical survey of 20 deg^2 has also been approved (PI Bouvier), and a more sensitive follow-up near-infrared (WIRCAM) survey is being planned. These surveys will for the first time characterize all stellar objects in TMC down to I = 24 mag, providing the indispensable means to identify nearly every X-ray detected object. Sensitive millimeter CO data will be added to map the molecular cloud structure.

A further large proposal (130 hours of exposure time) has been accepted for observations with the Spitzer Space Telescope, the largest available near- to mid-infrared observatory, covering the entire TMC region (29 deg^2) in all available mid-infrared bands. The principal purpose of this survey is to characterize the entire TMC population, find circumstellar disks, and penetrate dense molecular clouds to study deeply embedded protostars.