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Дата изменения: Thu Jan 16 14:02:33 2003
Дата индексирования: Tue Dec 25 13:14:15 2007
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NGC 1700: Elliptical Galaxy and Rotating Disk
Astronomy Picture of the Day
    


NGC 1700: Elliptical Galaxy and Rotating Disk
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NGC 1700:  Elliptical Galaxy and Rotating Disk
Credit: Thomas S. Statler, Brian R. McNamara (Ohio Univ.), CXC, NASA
Explanation: In spiral galaxies, majestic winding arms of young stars and interstellar gas and dust rotate in a disk around a bulging galactic nucleus. Elliptical galaxies seem to be simpler, randomly swarming with old stars and lacking gas and dust. So astronomers were excited to find that NGC 1700, a young elliptical galaxy about 160 million light-years away, shows evidence for a 90,000 light-year wide rotating disk of multi-million degree hot gas. The evidence comes from data recorded by the orbiting Chandra Observatory, whose sharp x-ray image of NGC 1700 is seen above. Balancing gravity, the rotation of the x-ray hot disk, the largest of its type yet discovered, gives the galaxy a pronounced boxy profile in this false-color picture. Theories about the origin of the disk suggest that NGC 1700 may be the result of a cosmic scale galactic merger, perhaps between a spiral and elliptical galaxy. NGC 1700 is just visible with small telescopes toward the flowing constellation Eridanus.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: NGC 1700 - Elliptical Galaxy - merging galaxies
Publications with words: NGC 1700 - Elliptical Galaxy - merging galaxies
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