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NGC 1569 Illustration
(Credit: NASA/CXC/M.Weiss)


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NGC 1569:
Dwarf Galaxy Gives universe A Breath of Fresh Oxygen


NGC 1569
Credit: NASA/CXC/UCSB/C.Martin et al.

The Chandra image of NGC 1569, a dwarf galaxy 7 million light years from Earth, shows large hot bubbles, or lobes extending above and below a disk of gas along the equator of the galaxy. The 27-hour observation allowed scientists to measure for the first time the concentration of oxygen, neon, magnesium, and silicon in the bubbles and the disk. They found that bubbles contain oxygen equal to the oxygen contained in 3 million suns.

For the last 10 million to 20 million years NGC 1569 has been undergoing a burst of star formation and supernova explosions, perhaps triggered by a collision with a massive gas cloud. The supernovas eject oxygen and other heavy elements at high velocity into the gas in the galaxy, heating it to millions of degrees. Hot gas boils off the gaseous disk of the galaxy to form the bubbles, which expand out of the galaxy at speeds of hundreds of thousands of miles per hour.

Dwarf galaxies are much smaller than ordinary galaxies like our Milky Way. Because of their size, they have relatively low gravity and matter can escape from them more easily. This property, combined with the fact that dwarf galaxies are the most common type of galaxy in the universe, makes them very important in understanding how the universe was seeded with various elements billions of years ago, when galaxies were forming.

Fast Facts for NGC 1569:
Credit  NASA/CXC/UCSB/C.Martin et al.
Scale  Image is 5.2 arcmin on a side.
Category  Normal Galaxies & Starburst Galaxies
Coordinates (J2000)  RA 04h 30m 49s | Dec +64° 50' 54"
Constellation  Camelopardalis
Observation Dates  April 11, 2000
Observation Time  27 hours
Obs. IDs  782
Color Code  Energy
Instrument  ACIS
Distance Estimate  About 7 million light years
Release Date  July 23, 2002