“This is the first time we’ve seen such a delicate piece of the galactic skeleton,” said Dr Goodman, who presented the discovery at a meeting of the American Astronomical Society in Long Beach, California.
Spiral galaxies display internal bones or endoskeletons. Observations have found long skinny features jutting between galaxies’ spiral arms. These relatively straight structures are much less massive than the curving spiral arms. Computer simulations of galaxy formation show webs of filaments within spiral disks. It is very likely that the newly discovered Milky Way feature is one of these bone-like filaments.
The team spotted the galactic bone while studying a dust cloud nicknamed Nessie. The central part of the Nessie bone was discovered in 2010 by Dr James Jackson of Boston University, who named it after the Loch Ness Monster.
Dr. Goodman’s team noticed that Nessie appears at least twice, and possibly as much as eight times, longer than Jackson’s original claim.
Radio emissions from molecular gas show that the feature is not a chance projection of material on the sky, but instead a real feature. Not only is ‘Nessie’ in the galactic plane, but also it extends much longer than anyone anticipated. This slender bone of the Milky Way is more than 300 light-years long but only 1 or 2 light-years wide. It contains about 100,000 Suns’ worth of material, and now looks more like a cosmic snake.