Posted on 06/05/2008 11:30:50 AM PDT by decimon
More than 800,000 snapshots from NASA's Spitzer Space Telescope have been stitched together to create a new "coming of age" portrait of stars in our inner Milky Way galaxy.
The image depicts an area of sky 120 degrees wide by two degrees tall. It was unveiled today at the 212th meeting of the American Astronomical Society in St. Louis, Mo.
"This is the highest-resolution, largest, most sensitive infrared picture ever taken of our Milky Way," said Sean Carey of NASA's Spitzer Science Center at the California Institute of Technology, Pasadena, Calif. Carey is lead investigator for one of two teams responsible for the new picture. "Where previous surveys saw a single source of light, we now see a cluster of stars. With this data, we can learn how massive stars form, map galactic spiral arms and make a better estimate of our galaxy's star-formation rate," Carey explained.
"I suspect that Spitzer's view of the galaxy is the best that we'll have for the foreseeable future. There is currently no mission planned that has both a wide field of view and the sensitivity needed to probe the Milky Way at these infrared wavelengths," said Barbara Whitney of the Space Science Institute, Madison, Wis. Whitney is a member of the second astronomy team.
Because Earth sits inside our dusty, flat, disk-shaped Milky Way, we have an edge-on view of our galactic home. We see the Milky Way as a blurry, narrow band of light that stretches almost completely across the sky. With Spitzer's dust-piercing infrared eyes, astronomers peered 60,000 light-years away into this fuzzy band, called the galactic plane, and saw all the way to the other side of the galaxy.
The result is a cosmic tapestry depicting an epic coming-of-age tale for stars. Areas hosting stellar embryos are identified by swaths of green, which are organic molecules, called polycyclic aromatic hydrocarbons, illuminated by light from nearby newborn stars. On Earth, these molecules are found in automobile exhaust and charred barbeque grills, essentially anywhere carbon molecules are burned incompletely.
The regions where young stars reside are revealed as "bubbles," or curved ridges in the green clouds. These bubbles are carved by the winds from young starlets blowing away their natal dust. The starlets appear as yellow and red dots, and the wisps of red that fill most bubbles are composed of graphite dust particles, similar to very small pieces of pencil lead.
Blue specks sprinkled throughout the photograph are individual older Milky Way stars. The bluish-white haze that hovers heavily in the middle two panels is starlight from the galaxy's older stellar population. A deep, careful examination of the image also shows the dusty remnants of dying and dead stars as translucent orange spheres.
"With these Spitzer data, we've been able to catalogue more than 100 million stars," said Edward Churchwell of the University of Wisconsin, at Madison. Churchwell is principal investigator of one of the teams.
"This picture shows us that our Milky Way galaxy is a crowded and dynamic place. We have a lot to learn. I've definitely found a lot of things in this map that I didn't expect to see," said Carey.
This infrared composite incorporates observations from two Spitzer instruments. Data from the infrared array camera were collected and processed by The Galactic Legacy Infrared Mid-Plane Survey Extraordinaire team, led by Churchwell. The Multiband Imaging Photometer for Spitzer Galactic Plane Survey Legacy team, led by Carey, processed observations from Spitzer's multiband imaging photometer. Blue represents 3.6-micron light, green shows light of 8 microns and red is 24-micron light.
NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the Spitzer Space Telescope mission for NASA's Science Mission Directorate, Washington. Science operations are conducted at the Spitzer Science Center at the California Institute of Technology, also in Pasadena. Caltech manages JPL for NASA.
Whitney Clavin 818-354-4673/818-648-9734 Jet Propulsion Laboratory, Pasadena, Calif.
Click on VISUALS for some pics. The first looks a Chevy ad.
What an unfortunate name for this telescope...
read later
I just can’t believe that occurred to you.
So did I, I guess I should have read past the first four words of the title..
He paid $5000 for THAT???
But it's still a Chevy.
I guess yours wins.
Centuries from now people will wonder over a period that could simultaneously produce these pictures and American Idol.
Yeah, it looks like she was giving out for free.
Thanks - that is an amazing picture. Hard to imagine that something on earth can “see” that far. We’ve come a long way since Galilao. (Actually - you can’t fool ME. Obviously it is taken from inside the landing bay of a Star Cruiser).
It’s mainly that they can do amazing tricks with wavelengths. You would never be able to see the galactic core because of the dust in between, but infrared has a longer wavelength than the dust particles themselves, so they become invisible to it. Pulling that off is tricky, though, since the lower the wavelength, the harder it is to focus on the source. That Spitzer is able to focus so precisely and yet get wide angle shots seems to be the amazing thing here.
The lower “frequency” the wavelength, that is. Without it’s misleading.
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