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News Release Archive:

News Release 688 of 955

January 9, 1998 12:00 AM (EST)

News Release Number: STScI-1998-01

Astronomers Discover an Infrared Background Glow in the Universe

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Image: COBE's Infrared View of the Universe

COBE's Infrared View of the UniverseSTScI-PRC1998-01

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ABOUT THIS IMAGE:

These three pictures are maps of the full sky as seen in infrared light. The top two are composite images taken in wavelengths of 60, 100, and 240 micrometers. The 60-micrometer brightness is shown in blue, the 100- micrometer brightness in green, and the 240-micrometer brightness in red. The bottom image shows just the 240-micrometer brightness after foreground light from the solar system and Galaxy has been removed.

The images were compiled from data taken between December 1989 and September 1990 by the Diffuse Infrared Background Experiment (DIRBE) on board NASA's Cosmic Background Explorer (COBE). They illustrate the steps scientists used to find the cosmic infrared background, which is a radiative fossil containing cumulative starlight which now appears in the infrared due to the cosmic redshift and by absorption and re-emission by dust in the universe since the Big Bang.

The top picture represents the brightness of the full sky as seen in infrared light. The bright yellow-orange line across the center of the image arises from interstellar dust in the plane of our Milky Way Galaxy, with the center of the Galaxy at the center of the image. The red color above and below this line shows additional wispy clouds of interstellar dust. The blue S-shaped color arises from interplanetary dust in the solar system.

The middle picture represents a view of the sky after the foreground glow of the solar system dust has been extracted. This image is dominated by emission from interstellar dust in the Milky Way Galaxy. The two bright objects in the center of the lower right quadrant are nearby galaxies, the Large and Small Magellanic Clouds.

After the infrared light from our solar system and galaxy has been removed, what remains is a uniform cosmic infrared background. The line across the center is an artifact from removal of galactic light. The DIRBE team reports detection of this cosmic background light also at 140 micrometers, and has set limits to its brightness at eight other infrared wavelengths from 1.25 to 100 micrometers.

Image Type: Astronomical

Credit: Michael Hauser (STScI), the COBE/DIRBE Science Team, and NASA

NEWS RELEASE IMAGES

The above montage includes these images:

COBE's Infrared View of the Universe: Observed Sky Image Type: Astronomical COBE's Infrared View of the Universe: Observed Sky COBE's Infrared View of the Universe: Zodiacal Light Removed Image Type: Astronomical COBE's Infrared View of the Universe: Zodiacal Light Removed COBE's Infrared View of the Universe: Extragalactic Background Image Type: Astronomical COBE's Infrared View of the Universe: Extragalactic Background

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