A magnified view of galaxy formation
Tucker Jones



Distant galaxies are difficult to study because of their small angular size and faint apparent brightness. I will discuss observations of gravitationally lensed galaxies which are highly magnified, providing sensitivity and spatial resolution comparable to what will be achieved with future thirty-meter class telescopes. These data reveal a wealth of information about galaxies' physical properties and evolution during their most active period of formation at redshifts z=1-3. Resolved spectroscopic data indicate that most galaxies at this epoch are forming stars in gravitationally unstable, turbulent disks. Their evolution is driven largely by secular processes, with feedback from star formation which regulates the distribution of gas and heavy elements. Spatially resolved metallicity measurements are now providing a valuable diagnostic of gas content and feedback-driven outflows. Looking forward, dedicated surveys of lensed galaxies from large telescopes on the ground and in space are dramatically increasing our knowledge of galaxy physical properties and the processes by which they form.