Deep Imaging Survey - Distant galaxies
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Deep Imaging Survey - Distant galaxies

April 19, 2005
This blowup of a small section of one of the GALEX Deep Imaging Survey (DIS) observations is a combination of images from the FUV detector (colored blue) and NUV detector (colored red).

Hundreds of galaxies are detected in this portion of the image, about 2% of the full image of a DIS region. The faint red objects in this image are believed to be galaxies at a distance of 6 billion light years.

The white boxes show the location of galaxies whose distance has been estimated from ground based measurements. The distance measurement labeled on the image is the redshift of the galaxy. Redshift is a shift toward longer wavelengths of emitted radiation caused by the emitting object moving away from the observer. When this occurs we see the light from the object become more red. This is similar to the Doppler effect.

Nearly every box has ultraviolet emission detected by GALEX indicating active star formation in these distant galaxies.

This observation is taken from only 14,000 seconds of the planned 40,000 second DIS observation of this region. When the DIS is completed more than 1 million distant galaxies will have been detected.

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