| Description: | At very faint radio flux densities, the radio sky is dominated by distant star-forming galaxies. These are galaxies that are forming stars at a fantastic (non-sustainable) rate, ~ 10-1000 times greater than our own Milky Way. New Mid-Infrared images from the Spitzer Space Telescope show that star forming galaxies are also dominant in deep 24 micron images of the sky. The striking correspondence between these 2 wavelength ranges is demonstrated above - a deep 1.4 GHz WSRT map (light blue contours) is superimposed on a (bright orange!) Spitzer Mid-IR image (Egami et al. astro-ph/0603657) of the same field. Most of the Spitzer/WSRT sources are located at moderate redshift (values indicated on the image) with the exception of a gravitationally lensed (multiply imaged & highly magnified) source located at z ~ 2.9 (see white circles). |
