EPoS Contribution
EPoS Contribution
Star formation at 2 kpc and beyond: Sucesses and limitations of Spitzer

Lori Allen
Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
Imaging surveys of star-forming regions in the nearby molecular clouds with the Spitzer Space Telescope (e.g. c2d, Taurus, Gould's Belt Legacy projects) are complete to very low luminosities (10^-3 M_sun) and masses (well into the brown dwarf regime). From these surveys we can draw inferences about the timescales for pre-main sequence evolution, the efficience of star formation, and the structure of young clusters.

The situation is quite different for more distant, massive star forming regions at 2 kpc and beyond, where most stars form. The Spitzer observations of these regions are more biased and less sensitive than the nearby cloud surveys. I will discuss recent results for both nearby and more distant regions, and consider the limitations of the Spitzer data at 2 kpc and beyond, as well as prospects for improvement in the future.