Resolving the Composite Fe Kα Emission Line in the Galactic Black Hole Cygnus X‐1 withChandra | Zendy

J. M. Mïller | Zendy; A. C. Fabian | Zendy; R. Wijnands | Zendy; Ronald A. Remillard | Zendy; Patrick S. Wojdowski | Zendy; Norbert S. Schulz | Zendy; Tiziana Di Matteo | Zendy; Herman L. Marshall | Zendy; C. R. Canizares | Zendy; D. Pooley | Zendy; W. H. G. Lewin | Zendy

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Resolving the Composite Fe Kα Emission Line in the Galactic Black Hole Cygnus X‐1 withChandra

Author(s) -

J. M. Mïller,

A. C. Fabian,

R. Wijnands,

Ronald A. Remillard,

Patrick S. Wojdowski,

Norbert S. Schulz,

Tiziana Di Matteo,

Herman L. Marshall,

C. R. Canizares,

D. Pooley,

W. H. G. Lewin

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/342466

Subject(s) - physics , astrophysics , active galactic nucleus , supermassive black hole , emission spectrum , black hole (networking) , galaxy , line (geometry) , full width at half maximum , accretion (finance) , spectral line , galactic center , context (archaeology) , astronomy , optics , geometry , computer network , paleontology , routing protocol , routing (electronic design automation) , mathematics , computer science , biology , link state routing protocol

We observed the Galactic black hole Cygnus X-1 with the Chandra High EnergyTransmission Grating Spectrometer for 30 kiloseconds on 4 January, 2001. Thesource was in an intermediate state, with a flux that was approximately twicethat commonly observed in its persistent low/hard state. Our best-fit model forthe X-ray spectrum includes narrow Gaussian emission line (E = 6.415 +/- 0.007keV, FWHM = 80 (+28, -19) eV, W = 16 (+3, -2) eV) and broad line (E = 5.82(+0.06, -0.07) keV, FWHM = 1.9 (+0.5, -0.3) keV, W = 140 (+70, -40) eV)components, and a smeared edge at 7.3 +/- 0.2 keV (tau ~ 1.0). The broad lineprofile is not as strongly skewed as those observed in some Seyfert galaxies.We interpret these features in terms of an accretion disk with irradiation ofthe inner disk producing a broad Fe K-alpha emission line and edge, andirradiation of the outer disk producing a narrow Fe K-alpha emission line. Thebroad line is likely shaped predominantly by Doppler shifts and gravitationaleffects, and to a lesser degree by Compton scattering due to reflection. Wediscuss the underlying continuum X-ray spectrum and these line features in thecontext of diagnosing the accretion flow geometry in Cygnus X-1 and otherGalactic black holes.Comment: Accepted for publication in Ap

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