ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] Clusters of galaxies are visible as concentrations of physically associated galaxies and as regions of extended X-ray emission. But optical surveys for distant clusters are hampered by the likely superposition of physically separate systems along the line of sight. This makes it difficult to use ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/377039a0
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