PIA14090: Little Galaxies Pack a Big Punch
Mission: Galaxy Evolution Explorer (GALEX)
Spacecraft: GALEX Orbiter
Instrument: Ultraviolet/Visible Camera
Product Size: 2004 x 1004 pixels (width x height)
Produced By: IPAC-Caltech
Other Information: JPL News Release 2011-122
Full-Res TIFF: PIA14090.tif (6.044 MB)
Full-Res JPEG: PIA14090.jpg (106.2 kB)

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Original Caption Released with Image:

NASA's Galaxy Evolution Explorer is helping to solve a mystery -- why do the littlest of galaxies produce the biggest of star explosions, or supernovae?

These postage-stamp images were taken by the ultraviolet-sensing telescope -- the top row shows four galaxies that each produced a typical supernova, while the bottom row shows four galaxies that each produced an ultra-bright supernova. All of the galaxies are located at the very center of the images. The top-row galaxies are roughly the size of our Milky Way galaxy.

It turns out that the tiny galaxies are producing supernovae that outshine all the stars in the galaxies in the top row. How can this be? Evidence from the Galaxy Evolution Explorer is helping provide an answer. It may be that, because the smaller galaxies contain few heavy atoms than the larger galaxies, their massive stars don't shed as much material and therefore remain plump. The plumper a star is when it explodes, the larger the blast.

The California Institute of Technology in Pasadena leads the Galaxy Evolution Explorer mission and is responsible for science operations and data analysis. NASA's Jet Propulsion Laboratory, also in Pasadena, manages the mission and built the science instrument. The mission was developed under NASA's Explorers Program managed by the Goddard Space Flight Center, Greenbelt, Md. Researchers sponsored by Yonsei University in South Korea and the Centre National d'Etudes Spatiales (CNES) in France collaborated on this mission.

Graphics and additional information about the Galaxy Evolution Explorer are online at http://www.nasa.gov/galex/ and http://www.galex.caltech.edu.

Image Credit:
NASA/JPL-Caltech

Image Addition Date:
2011-04-21