Release Images

Release No.: 2007-34
For Release: Tuesday, December 25, 2007 - 7:00pm

Jets Are a Real Drag

protostar

This artist's concept shows a still-forming protostar which is accreting material from a surrounding disk. Some of the material from the disk, rather than falling onto the star, is ejected outward in a bipolar jet. New measurements from the Submillimeter Array show that matter in the jet is rotating around the jet's axis in a sort of "reverse whirlpool," which carries angular momentum away from the system and helps the star grow.

Change Tsai (ASIAA)

Herbig-Haro 211

This composite photograph of Herbig-Haro 211 shows submm data from the Submillimeter Array (blue and red) and near-infrared data from the European Very Large Telescope (gray). The SMA data were color-coded blue for approaching (blue-shifted) material and red for receding (red-shifted) material. The VLT shows shocked molecular hydrogen emission produced by the jet.

SMA/Chin-Fei Lee & VLT/Naomi Hirano