Boomerang results

The BOOMERanG experiment has mapped the mm/sub-mm sky during two long duration balloon flights (in 1998 and 2003). The first flight has produced maps of about 4% of the sky at 90, 150, 240 and 410 GHz with resolution of 10'. The faint structure of the Cosmic Microwave Background at horizon and sub-horizon scales is evident in these maps, and the wide frequency coverage allows for a careful estimate of the Galactic foreground. In the second flight a polarization-sensitive version of the instrument has been flown, to measure the linear polarization of the microwave sky at 150, 240 and 350 GHz. Preliminary results and plans for future developments are reported.