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News Release Archive:

News Release 305 of 955

September 6, 2007 12:00 PM (EDT)

News Release Number: STScI-2007-31

Hubble and Spitzer Space Telescopes Find "Lego-Block" Galaxies in Early Universe

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Image: Hubble and Spitzer Uncover Smallest Galaxy Building Blocks

Hubble and Spitzer Uncover Smallest Galaxy Building BlocksSTScI-PRC2007-31a

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ABOUT THIS IMAGE:

In this image of the Hubble Ultra Deep Field, several objects are identified as the faintest, most compact galaxies ever observed in the distant universe. They are so far away that we see them as they looked less than one billion years after the Big Bang. Blazing with the brilliance of millions of stars, each of the newly discovered galaxies is a hundred to a thousand times smaller than our Milky Way Galaxy.

The bottom row of pictures shows several of these clumps (distance expressed in redshift value). Three of the galaxies appear to be slightly disrupted. Rather than being shaped like rounded blobs, they appear stretched into tadpole-like shapes. This is a sign that they may be interacting and merging with neighboring galaxies to form larger structures.

The detection required joint observations between Hubble and NASA's Spitzer Space Telescope. Blue light seen by Hubble shows the presence of young stars. The absence of infrared light from Spitzer observations conclusively shows that these are truly young galaxies without an earlier generation of stars.

Object Name: HUDF

Image Type: Astronomical/Illustration/Annotated

Credit: NASA, ESA, and N. Pirzkal (STScI/ESA)

NEWS RELEASE IMAGES

The above montage includes these images:

Hubble Ultra Deep Field Image Type: Astronomical Hubble Ultra Deep Field Hubble Building Blocks Galaxy at Redshift 4.00 Image Type: Astronomical Hubble Building Blocks Galaxy at Redshift 4.00 Hubble Building Blocks Galaxy at Redshift 4.88 Image Type: Astronomical Hubble Building Blocks Galaxy at Redshift 4.88 Hubble Building Blocks Galaxy at Redshift 4.90 Image Type: Astronomical Hubble Building Blocks Galaxy at Redshift 4.90 Building Block Galaxy at Redshift of 5.42 from Hubble Ultra Deep Field Image. Image Type: Astronomical Building Block Galaxy at Redshift of 5.42 from Hubble Ultra Deep Field Image. Hubble Building Blocks Galaxy at Redshift 5.76 Image Type: Astronomical Hubble Building Blocks Galaxy at Redshift 5.76

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