First 'bone' of the Milky Way identified

Jan 08, 2013
Researchers have identified the first "bone" of the Milky Way - a long tendril of dust and gas that appears dark in this infrared image from the Spitzer Space Telescope. Running horizontally along this image, the "bone" is more than 300 light-years long but only 1 or 2 light-years wide. It contains about 100,000 suns' worth of material. Credit: NASA/JPL/SSC

(Phys.org)—Our Milky Way is a spiral galaxy—a pinwheel-shaped collection of stars, gas and dust. It has a central bar and two major spiral arms that wrap around its disk. Since we view the Milky Way from the inside, its exact structure is difficult to determine.

Astronomers have identified a new structure in the Milky Way: a long tendril of dust and gas that they are calling a "bone."

"This is the first time we've seen such a delicate piece of the galactic skeleton," says lead author Alyssa Goodman of the Harvard-Smithsonian Center for Astrophysics (CfA). Goodman presented the discovery today in a press conference at a meeting of the in Long Beach, Calif.

Other spiral galaxies also display internal bones or endoskeletons. Observations, especially at of light, have found long skinny features jutting between galaxies' . These relatively straight structures are much less massive than the curving spiral arms.

Computer simulations of 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.

Goodman and her colleagues spotted the galactic bone while studying a dust cloud nicknamed "Nessie." The central part of the "Nessie" bone was discovered in Spitzer Space Telescope data in 2010 by James Jackson (Boston University), who named it after the Loch Ness Monster. Goodman's team noticed that Nessie appears at least twice, and possibly as much as eight times, longer than Jackson's original claim.

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.

"This bone is much more like a fibula - the long skinny bone in your leg - than it is like the tibia, or big thick leg bone," explains Goodman.

"It's possible that the 'Nessie' bone lies within a spiral arm, or that it is part of a web connecting bolder spiral features. Our hope is that we and other astronomers will find more of these features, and use them to map the skeleton of the Milky Way in 3-D," she adds.

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More information: For more information, visit milkywaybones.org

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User comments : 4

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Jeddy_Mctedder
3.7 / 5 (3) Jan 08, 2013
Can we call it a milkbone?
yyz
5 / 5 (3) Jan 08, 2013
"The central part of the "Nessie" bone was discovered in Spitzer Space Telescope data in 2010 by James Jackson (Boston University), who named it after the Loch Ness Monster."

I remember seeing this work posted on arXiv in 2010; the discovery paper is available here: http://arxiv.org/abs/1007.5492

An infrared view of the extended Nessie Nebula is available here: http://mpia.de/~r...nded.jpg
LarryD
5 / 5 (6) Jan 08, 2013
Actually I am not 'up' on this moder astro terminology. Is it called a 'bone' because it has an epiphysis/metaphysis structure at the end points? Oh I get it! Is it close to Canis Major and Sirius? All sound a bit 'Humerus' to me.
kevinrtrs
1 / 5 (9) Jan 09, 2013
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.

Unfortunately, the simulations are based on a theorectical model with very little basis in reality. No one has any experience of the formation of any galaxy since no one was around to record how any galaxy came into existence.
Therefore, the model used here is based on pure speculation of how galaxies MIGHT have formed.
One tiny little problem, for instance, would be how to account for the existence of galactic magnetic fields.

How did that arise, given the inability of the currently accepted model to account for just that small, insignificant thorn in the flesh?

Never mind the other small thorn of how the first star came into being in the first place, all by itself.

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