Gravitational microlensing, quasar variability and missing matter

Quasars have long been known to vary in magnitude, and it now appears that all quasars are to some extent variable. The longer-term behavior for a sample of approximately 300 quasars is investigated.

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Bibliographische Detailangaben
Veröffentlicht in:	Nature (London) 1993-11, Vol.366 (6452), p.242-245
1. Verfasser:	Hawkins, M. R. S
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Characteristics and properties of external galaxies and extragalactic objects Earth, ocean, space Exact sciences and technology Gravitational lenses and luminous arcs Quasars Quasars. Active or peculiar galaxies, objects, and systems Stellar systems. Galactic and extragalactic objects and systems. The universe
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Beschreibung
Zusammenfassung:	Quasars have long been known to vary in magnitude, and it now appears that all quasars are to some extent variable. The longer-term behavior for a sample of approximately 300 quasars is investigated.
ISSN:	0028-0836 1476-4687
DOI:	10.1038/366242a0