Hubble Illuminates Cluster Of Diverse Galaxies

STELLAR CHEMISTRY

This NASA Hubble Space Telescope image shows the diverse collection of galaxies in a galaxy cluster called Abell S0740, located more than 450 million light-years away in the constellation Centaurus. The giant elliptical galaxy ESO 325-G004 looms large at the cluster's center. This galaxy is as massive as 100 billion suns. Hubble resolves thousands of globular star clusters orbiting ESO 325-G004. Globular clusters are compact groups of hundreds of thousands of stars that are gravitationally bound together. At the galaxy's distance they appear as pinpoints of light contained within the diffuse halo. Other elliptical and spiral galaxies appear in the image. The photo was made from images taken using Hubble's Advanced Camera for Surveys in January 2005 and February 2006. Credit: NASA, ESA, and The Hubble Heritage Team (STScI/AURA) Acknowledgment: J. Blakeslee (Washington State University) Space Telescope Science Institute

by Staff Writers
Baltimore, MD (SPX) Feb 12, 2007
This image from NASA's Hubble Space Telescope shows the diverse collection of galaxies in the cluster Abell S0740 that is over 450 million light-years away in the direction of the constellation Centaurus.

The giant elliptical ESO 325-G004 looms large at the cluster's center. The galaxy is as massive as 100 billion of our suns. Hubble resolves thousands of globular star clusters orbiting ESO 325-G004. Globular clusters are compact groups of hundreds of thousands of stars that are gravitationally bound together. At the galaxy's distance they appear as pinpoints of light contained within the diffuse halo.

Other fuzzy elliptical galaxies dot the image. Some have evidence of a disk or ring structure that gives them a bow-tie shape. Several spiral galaxies are also present. The starlight in these galaxies is mainly contained in a disk and follows along spiral arms.

This image was created by combining Hubble science observations taken in January 2005 with Hubble Heritage observations taken a year later to form a 3-color composite. The filters that isolate blue, red and infrared light were used with the Advanced Camera for Surveys aboard Hubble.

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STELLAR CHEMISTRY

High-Energy Relic Wind Reveals Past Behavior Of Dead Stars

Palo Alto CA (SPX) Feb 07, 2007
A team of astronomers from France and South Africa, members of the H. E.S.S. (the High Energy Stereoscopic System) multi-national collaboration, has announced the first catalog of a new type of gamma-ray source, a dozen clouds of "relic" radiation from dead stars that reveal information about the energetic past of these celestial objects.

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