astronomie:cartwheelgalaxy.jpg

Approximately 100 million years ago, a smaller galaxy plunged through the heart
of the Cartwheel galaxy, creating ripples of brief star formation. In this
image, the first ripple appears as an ultraviolet-bright blue outer ring so
powerful that it may be one of the most powerful UV-emitting galaxies in the
nearby universe.
This false-color composite image shows the Cartwheel galaxy as seen by the
Galaxy Evolution Explorer (GALEX), the Hubble Space Telescope (green); the
Spitzer Space Telescope (red); and the Chandra X-ray Observatory (purple).
Although astronomers have not identified exactly which galaxy collided with the
Cartwheel, two of three candidate galaxies can be seen in this image to the
bottom left of the ring, one as a neon blob and the other as a green spiral. 
Previously, scientists believed the ring marked the outermost edge of the
galaxy, but the latest GALEX observations detect a faint disk, not visible in...

Approximately 100 million years ago, a smaller galaxy plunged through the heart
of the Cartwheel galaxy, creating ripples of brief star formation. In this
image, the first ripple appears as an ultraviolet-bright blue outer ring so
powerful that it may be one of the most powerful UV-emitting galaxies in the
nearby universe.
This false-color composite image shows the Cartwheel galaxy as seen by the
Galaxy Evolution Explorer (GALEX), the Hubble Space Telescope (green); the
Spitzer Space Telescope (red); and the Chandra X-ray Observatory (purple).
Although astronomers have not identified exactly which galaxy collided with the
Cartwheel, two of three candidate galaxies can be seen in this image to the
bottom left of the ring, one as a neon blob and the other as a green spiral.
Previously, scientists believed the ring marked the outermost edge of the
galaxy, but the latest GALEX observations detect a faint disk, not visible in...

Date::
2006/12/06 12:51
Nom de fichier::
cartwheelgalaxy.jpg
Légende::
Approximately 100 million years ago, a smaller galaxy plunged through the heart of the Cartwheel galaxy, creating ripples of brief star formation. In this image, the first ripple appears as an ultraviolet-bright blue outer ring so powerful that it may be one of the most powerful UV-emitting galaxies in the nearby universe. This false-color composite image shows the Cartwheel galaxy as seen by the Galaxy Evolution Explorer (GALEX), the Hubble Space Telescope (green); the Spitzer Space Telescope (red); and the Chandra X-ray Observatory (purple). Although astronomers have not identified exactly which galaxy collided with the Cartwheel, two of three candidate galaxies can be seen in this image to the bottom left of the ring, one as a neon blob and the other as a green spiral. Previously, scientists believed the ring marked the outermost edge of the galaxy, but the latest GALEX observations detect a faint disk, not visible in this image, that extends to twice the diameter of the ring.
Copyright::
NASA/JPL-Caltech
Format::
JPEG
Taille::
74KB
Largeur::
450
Hauteur::
450
Mots-clés::
jpl, nasa, astronomy, Chandra X-ray Observatory, Spitzer Space telescope, Hubble Space Telescope, galex, galaxy Evolution Explorer, UV-emitting galaxy, UV-emitting galaxies, nature, star formations, star formation, stars, ripples, cartwheel galaxy, galaxy, stellar ripple

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