ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] Some X-ray transient sources have 'ultra-soft' (low-energy) spectra11. The mass of one such source, the X-ray star in AO620 -00, has been estimated to be greater than 3 Má© (ref. 12), indicating that ultra-soft sources may contain black holes13. Other X-ray transient sources may be ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/342518a0
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