ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] The QSO was discovered during a programme aimed at the identification ofoptical counterparts of X-ray sources observed serendipitously by the Einstein Observatory. The detector used, the imaging proportional counter5, yields positional accuracies of the order of 1 arc min, typically restricting ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/290480a0
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