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Lady In Red: Andromeda Galaxy Shines In Spitzer's Eyes

Date:
October 17, 2005
Source:
NASA/Jet Propulsion Laboratory
Summary:
NASA's Spitzer Space Telescope has captured a stunning infrared view of Messier 31, the famous spiral galaxy also known as Andromeda. Andromeda is the most-studied galaxy outside our own Milky Way, yet Spitzer's sensitive infrared eyes have detected captivating new features, including bright, aging stars and a spiral arc in the center of the galaxy. The infrared image also reveals an off-centered ring of star formation and a hole in the galaxy's spiral disk of arms.
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The infrared Spitzer image reveals new insight into Andromeda's well-known ring of star formation. This ring appears to be split into two pieces, forming the hole to the lower right. These asymmetrical features may have been caused by interactions with satellite galaxies around Andromeda. Image credit: NASA/JPL-Caltech/Univ. of Arozona

NASA's Spitzer Space Telescope has captured a stunning infrared viewof Messier 31, the famous spiral galaxy also known as Andromeda.

Andromeda is the most-studied galaxy outside our own Milky Way, yetSpitzer's sensitive infrared eyes have detected captivating newfeatures, including bright, aging stars and a spiral arc in the centerof the galaxy. The infrared image also reveals an off-centered ring ofstar formation and a hole in the galaxy's spiral disk of arms. Theseasymmetrical features may have been caused by interactions with theseveral satellite galaxies that surround Andromeda.

"Occasionally small satellite galaxies run straight through biggergalaxies," said Dr. Karl Gordon of the Steward Observatory, Universityof Arizona, Tucson, lead investigator of the new observation. "Itappears a little galaxy punched a hole through Andromeda's disk, muchlike a pebble breaks the surface of a pond."

The new false-color Andromeda image is available at http://www.spitzer.caltech.edu/spitzer/ .

Approximately 2.5 million light-years away, Andromeda is the closestspiral galaxy and is the only one visible to the naked eye. Unlike ourMilky Way galaxy, which we view from the inside, Andromeda is studiedfrom the outside. Astronomers believe that Andromeda and the Milky Waywill eventually merge together.

Spitzer detects dust heated by stars in the galaxy. Its multibandimaging photometer's 24-micron detector recorded approximately 11,000separate infrared snapshots over 18 hours to create the newcomprehensive mosaic. This instrument's resolution and sensitivity is avast improvement over previous infrared technologies, enablingscientists to trace the spiral structures within Andromeda to anunprecedented level of detail.

"In contrast to the smooth appearance of Andromeda at opticalwavelengths, the Spitzer image reveals a well-defined nuclear bulge anda system of spiral arms," said Dr. Susan Stolovy, a co-investigatorfrom the Spitzer Science Center at the California Institute ofTechnology, Pasadena.

The galaxy's central bulge glows in the light emitted by warm dustfrom old, giant stars. Just outside the bulge, a system of inner spiralarms can be seen, and outside this, a well-known prominent ring of starformation.

NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages theSpitzer mission for NASA's Science Mission Directorate, Washington.Science operations are conducted at the Spitzer Science Center at theCalifornia Institute of Technology. The Jet Propulsion Laboratory is adivision of Caltech.


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The above story is based on materials provided by NASA/Jet Propulsion Laboratory. Note: Materials may be edited for content and length.


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NASA/Jet Propulsion Laboratory. "Lady In Red: Andromeda Galaxy Shines In Spitzer's Eyes." ScienceDaily. ScienceDaily, 17 October 2005. <www.sciencedaily.com/releases/2005/10/051017070302.htm>.
NASA/Jet Propulsion Laboratory. (2005, October 17). Lady In Red: Andromeda Galaxy Shines In Spitzer's Eyes. ScienceDaily. Retrieved May 28, 2015 from www.sciencedaily.com/releases/2005/10/051017070302.htm
NASA/Jet Propulsion Laboratory. "Lady In Red: Andromeda Galaxy Shines In Spitzer's Eyes." ScienceDaily. www.sciencedaily.com/releases/2005/10/051017070302.htm (accessed May 28, 2015).

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