View Full Version : Galaxy Clusters Have Different Supernova Yields

2006-May-16, 06:51 PM
SUMMARY: Galaxy clusters are the largest objects in the Universe. Each cluster can contain hundreds or even thousands of galaxies held together by gravity. These clusters are filled with hot gas, emitting a tremendous amount of X-ray radiation. ESA's XMM-Newton observatory recently watched two galaxy clusters enabling astronomers to learn that these clusters have higher quantities of Type 1a supernovae - exploding white dwarf stars - than our own galaxy.

View full article (http://www.universetoday.com/am/publish/xmmnewton_elements_origin.html)
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2006-May-21, 04:28 PM
The astronomers also found that all supernova models predict much less calcium than what is observed in clusters, and that the observed nickel abundance cannot be reproduced by these models. These discrepancies indicate that that the details of supernova enrichment is not yet clearly understood.
Since the current 'Dark Energy' model of the universe is based upon a primary assumption that we do understand supernova, these studies place a firm asterisk upon any of the conclusions drawn from supernova studies.