Delayed hard X-rays from Cygnus X-1

Cygnus X-1 is a black hole candidate that emits X-rays whose flux varies on many timescales. Cygnus X-1 was observed in its low state and analysis of the data reveals that the delay of the high-energy X-rays increases from approximately 2 ms to several seconds for periods from 0.1 to 300 s.

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Bibliographic Details
Published in:	Nature (London) Vol. 336; no. 6198; pp. 450 - 452
Main Authors:	MIYAMOTO, S, KITAMOTO, S, MITSUDA, K, DOTANI, T
Format:	Journal Article
Language:	English
Published:	London Nature Publishing 01-12-1988 Nature Publishing Group
Subjects:	Astronomy Astrophysics Black holes Earth, ocean, space Exact sciences and technology Space Stellar systems. Galactic and extragalactic objects and systems. The universe Unidentified sources and radiation outside the solar system X-ray sources ; x-ray bursts Data analysis Observed data X ray source X ray spectrum Data processing Time variation X ray emission
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Description
Summary:	Cygnus X-1 is a black hole candidate that emits X-rays whose flux varies on many timescales. Cygnus X-1 was observed in its low state and analysis of the data reveals that the delay of the high-energy X-rays increases from approximately 2 ms to several seconds for periods from 0.1 to 300 s.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0028-0836 1476-4687
DOI:	10.1038/336450a0