MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 TELEPHONE 818-354-5011
Whitney Clavin 818-354-4673/818-648-9734
Jet Propulsion Laboratory, Pasadena, Calif.
whitney.b.clavin@jpl.nasa.gov
IMAGE ADVISORY: 2008-095 June 3, 2008
Spitzer Captures Stellar Coming of Age in Our Galaxy
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, which depicts an area of sky 120 degrees wide by two degrees tall, can be
viewed at http://www.nasa.gov/mission_pages/spitzer/multimedia/20080603.html . 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.
For more information about Spitzer, visit http://www.spitzer.caltech.edu/spitzer and
-end-
To remove yourself from all mailings from NASA Jet Propulsion Laboratory, please go to http://www.kintera.org/TR.asp?a=hrKPI2OMLlIPK7J&s=iiLYI1MFKeKKJ0MLLsF&m=ieLSJSPuHlIXF
No comments:
Post a Comment