Broad Iron Lines in Active Galactic Nuclei | Zendy

A. C. Fabian | Zendy; K. Iwasawa | Zendy; C. S. Reynolds | Zendy; A. J. Young | Zendy

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Broad Iron Lines in Active Galactic Nuclei

Author(s) -

A. C. Fabian,

K. Iwasawa,

C. S. Reynolds,

A. J. Young

Publication year - 2000

Publication title -

publications of the astronomical society of the pacific

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.294

H-Index - 172

eISSN - 1538-3873

pISSN - 0004-6280

DOI - 10.1086/316610

Subject(s) - physics , astrophysics , active galactic nucleus , accretion (finance) , galaxy , astronomy , redshift , line (geometry) , black hole (networking) , accretion disc , gravitation , supermassive black hole , emission spectrum , spectral line , doppler effect , strong gravity , geometry , computer network , routing protocol , mathematics , routing (electronic design automation) , computer science , link state routing protocol

An intrinsically narrow line emitted by an accretion disk around a black holeappears broadened and skewed as a result of the Doppler effect andgravitational redshift. The fluorescent iron line in the X-ray band at6.4-6.9keV is the strongest such line and is seen in the X-ray spectrum of manyactive galactic nuclei and, in particular, Seyfert galaxies. It is an importantdiagnostic with which to study the geometry and other properties of theaccretion flow very close to the central black hole. The broad iron lineindicates the presence of a standard thin accretion disk in those objects,often seen at low inclination. The broad iron line has opened up stronggravitational effects around black holes to observational study withwide-reaching consequences for both astrophysics and physics.Comment: 26 pages. Invited review, accepted for publication in PAS

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